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STGE4

Sonar Technician (Surface)

E-4 (Specialist/Corporal) · Navy

E1–E3E-4E-5E-6E-7E8–E9
HEADS UP

STG3 is the first real petty officer paygrade in the rate — the crow means the sonar supervisor puts your name on the watch bill as a qualified watchstander, not as the assistant. The C-school and NEC track conversation is now serious. Pull the current NEC source-rating NAVADMIN and the OPNAVINST 1306.2 detailing guidance before you commit to a path based on mess-deck intel.

The Honest MOS Read
You are a Petty Officer Third Class in the ship's sonar division. The crow changed what the LCPO expects from you overnight — you now own a section of the maintenance bill, sign corrective actions, train the STGSN who checked aboard after you, and stand a qualified sonar watch without the watch supervisor's hand on your elbow. On a DDG-51 in a COMPTUEX rotation, that means fault-isolating a towed array depth-control anomaly before the scheduled ASW exercise, documenting the corrective action to QA standard, briefing the sonar supervisor on the system status, and picking up the console for the evolution's two-hour watch rotation without a break in the watchteam's acoustic picture. The maintenance work at STG3 is more demanding than at STGSN because you are the first review layer before QA. When a STGSN brings you a maintenance action to co-sign, you actually read it — the incorrect MRC step, the vague discrepancy description, the missing corrective-action reference — and send it back for rework before QA does. Your initials are the standard the work center supervisor trusts. The 3-M system traces every closed action to the last signature, and when the Type Commander ASW assessment finds a sloppy entry under your work center, the first question is who signed it. The acoustic classification work deepens at STG3. You are not the assistant anymore; you are the console operator for your section of the watch rotation, responsible for building and maintaining the sonar picture on the AN/UYQ-25, calling contacts, updating track data, and coordinating with the LAMPS MH-60R crew's tactical data link during ASW exercises. The training tapes at Dam Neck gave you the vocabulary. The sonar supervisor at quarters the morning after a poor exercise performance will tell you exactly where the classification calls went wrong — and you will spend the next day figuring out how to not make the same call again. The NEC and C-school conversation is no longer hypothetical. The LCPO is asking where you want to go because the ship's billet programming requires it — NEC pipeline nominations happen on a cycle tied to the ship's readiness plan, not to the individual sailor's preference timeline. The STG3 who walks into the LCPO's office with a clear answer based on having read NAVPERS 18068 Vol II and the current source-rating NAVADMIN is the STG3 who gets the pipeline the ship needs. The one who has not thought about it gets the billet the ship needs filled regardless of preference. The NWAE for STG2 is now a live preparation item. The advancement cycle comes around twice a year and the BIB for the cycle is published on MyNavyHR/NETC. Build the study plan now — not after the next deployment, now. The STG3 whose NWAE score is in the top tier of the cycle is the STG3 the LCPO advocates for at the next advancement ranking; the one who walked in cold is the one watching the slate.
Career Arc
  • 01Pin STG3 via NWAE — first advancement that required a competitive exam score and the LPO's recommendation.
  • 02Own a section of the sonar division's PMS schedule — sign maintenance actions and be the first QA review layer before the work center supervisor.
  • 03Earn Surface Warfare (SW) device — PQS qualification across the ship's warfare areas; the device is noticed at every eEVAL ranking board.
  • 04Start the NEC / C-school pipeline conversation with the LCPO — have a clear answer based on NAVPERS 18068 Vol II and the current source-rating NAVADMIN.
  • 05NWAE for STG2 prep on the LCPO's study-plan timeline — current BIB, documented study log, not a cold walk-in.
  • 06First NEC pipeline nomination or C-school packet submitted — the ship's billet plan requires it before the next deployment workup.
  • 07Pin STG2 (E-5) — the milestone the sonar community uses to identify the sailor who is becoming a technical leader, not just a competent watchstander.
Common Screwups
  • ×Co-signing a maintenance action you did not personally review. Your initials on the closed MRC are the standard; if QA finds the error on a closed entry you signed without reading, the 3-M audit finding is under your name and the work center supervisor's trust in your review does not recover quickly.
  • ×Calling a biologic as a possible sub contact on a live watch evolution. False classification starts a tracking chain the TAO has to unwind, wastes ASW resources, and marks the STG3 as unreliable to the sonar supervisor before the watch is over. The inverse — missing a real contact — is worse. If you are not sure, say so explicitly.
  • ×OPSEC breach — any public discussion of sonar capabilities, acoustic intelligence activities, or ship-movement patterns. One post, one comment, one overheard conversation ends the career. The standard at STG3 is the same standard it was at STGSN: absolute.
  • ×Failing to notify the watch supervisor when a system anomaly appears during an evolution — towed array depth excursion, BIT fault on the AN/SQS-53C, EMSP processing fault — because you did not want to interrupt the exercise. The fault that goes unreported is the casualty the next watchteam discovers.
  • ×NJP / DUI / drug pop — the clearance issues close the NEC pipeline permanently, the separation process is fast, and the sonar community does not have the size to absorb the read quietly.

A Day in the Life

  • 0500-0600Reveille. At sea: uniform on, check the watchbill for the day's watch rotation and any pre-watch maintenance requirements. In port: PT gear for morning formation.
  • 0600-0700Command PT on the flight deck or pier. STG3s run with the division. Underway, this happens on the flight deck weather permitting or in the ship's gym.
  • 0700-0745Hygiene, breakfast in the mess deck, change to NWU. Pre-watch brief review if you are section lead on the upcoming sonar watch rotation.
  • 0745-0800Quarters at the sonar division. MRC assignments for the day, training event schedule, any readiness metrics the LCPO is briefing from the previous day's system status.
  • 0800-1130Maintenance block. Own your section's assigned MRCs — hull sonar equipment room, towed array electronics, EMSP signal processing racks. Review STGSN's completed entries before they go to QA. Log your own actions same-day. If the ship is underway and conducting an ASW exercise, this block is a watch rotation in the sonar module or CIC.
  • 1130-1230Lunch. Section debrief if there was a morning ASW exercise — the STG2 or sonar supervisor will run a brief AAR on contact classifications and watchteam performance.
  • 1230-1500Afternoon maintenance continuation, or divisional training day depending on the plan of the week. PQS walkthrough for the STGSN you are responsible for — sign items you were present for. NWAE study if the LPO approved it.
  • 1500-1600NWAE study period or technical self-study. BIB chapter work. NAVPERS 18068 NEC research — know what you want before the LCPO asks.
  • 1600-1630End-of-day closeout. MRC documentation confirmed. STGSN's entries reviewed. Work center supervisor briefed on any system status changes or deferred maintenance.
  • 1630-2200Released if not on watch. Gym, berthing, study. Underway watch rotation: 6-on, 12-off. Sonar module watch in the off-watch cycle means berthing for sleep, then back to the console.
  • Underway ASW exercise / COMPTUEXWatch-rest-watch cycle, 6 on and 12 off. Pre-watch brief from the sonar supervisor with contact history and environmental picture. Console watch with the ASW coordinator on the net. Post-watch: update the 3-M maintenance log, brief the oncoming watch on any system anomalies. Sleep in the berthing in 4-6 hour blocks.

Weekly Cadence

The STG3 week is driven by the maintenance schedule, the watchbill, and the NWAE study plan — all three running simultaneously. Monday has the highest density of new MRC assignments from the work center supervisor's weekly planning sync with the LCPO. Tuesday and Wednesday are the working core — maintenance execution, STGSN training, watch rotations. Thursday is often divisional training day: the STG2 or STG1 runs a technical familiarization or fault-isolation exercise that feeds the next PQS section. Friday is plan-of-the-week-out and the LPO's section sync where advancement progress, maintenance metrics, and any personnel actions are reviewed. The rhythm changes completely during COMPTUEX and deployment. The maintenance schedule becomes reactive to the exercise schedule and real-world system casualties; the watchbill is the daily structure; the study plan happens in the 12-off window. The STG3 who built the study habit in garrison carries it underway without thinking about it. The one who was waiting for a quiet week to start the BIB is the one who arrives at the advancement cycle having not studied. The NEC counseling conversation should happen during a port call or a garrison week, not during the compressed workup calendar. Ask the LCPO for a formal session at least six months before you expect orders to drop — the billet programming that determines which C-school quota you get runs on a longer cycle than most STG3s realize.

Key Skills — How to Drill Each

  1. 01
    Execute a PMS MRC on an AN/SQQ-89(V) component — hull sonar, towed array electronics, or signal processor — and document the action in the ship's 3-M system without return-for-rework from QA.
    Read the MRC step-by-step, in sequence, before touching the system — not as you go. Log the action the same day in the 3-M system with the correct job sequence number, the MRC document number and revision, a clear corrective-action description, and your signature. Before you hand it to the work center supervisor for initial review, read your own entry the way a QA reviewer would: does the corrective action actually match the fault? Is the job sequence number correct? Is the MRC reference current? The entry that comes back to you once from QA is an education; the entry that comes back twice is a pattern.
  2. 02
    Stand a qualified sonar watch at the AN/UYQ-25 console — classify contacts, report track data to the sonar supervisor and ASW coordinator, and update the tactical picture at the speed the watchteam expects.
    Build the acoustic picture in your head before you sit down by reading the pre-watch brief. Know what the watch-section's previous contacts were, where the own-ship maneuver history is taking the towed array, and what the environmental profile (sound velocity profile, layer depth, convergence zone estimate) says about active sonar detection range. Call every contact you see — bearing, signal characteristics, classification estimate, confidence. The sonar supervisor is not grading the certainty of your calls; he is grading whether you are applying the procedures consistently. The STG3 who stops calling contacts because he is uncertain is the one who misses the real contact.
  3. 03
    Identify and report a sonar system fault at the component level with the correct technical language and the correct maintenance reporting chain before the watch supervisor asks.
    The diagnostic sequence is: observe the anomaly on the console or in the equipment space, isolate the affected component by designation (which cabinet, which assembly, which card), cross-reference the applicable NAVSEA technical manual fault isolation procedure, document the discrepancy in the 3-M system with a safety-of-ship determination (does this fault degrade ASW readiness in a way the department head needs to know?), and brief the sonar supervisor before the watch ends. The STG3 who walks up to the watch supervisor at watch relief and says 'by the way, the EMSP has been throwing fault codes for the last hour' is the STG3 who does not stand an independent watch much longer.
  4. 04
    Coordinate the acoustic picture with the embarked LAMPS MH-60R crew — pass target motion analysis (TMA) data and sonobuoy field positions using the ship's ASW tactical data link procedures.
    The MH-60R crew is running their own acoustic picture from the helicopter-side; your job is to ensure the ship's and the helo's pictures are talking to each other, not contradicting each other. Know the ASW tactical data link procedure the ship uses for LAMPS coordination — the sonar supervisor will brief it during pre-watch, and the STG3 who needs to be re-briefed every time is the one the helo crew stops coordinating with in real time. This is a qualification line item on the PQS and a watch-section performance metric.
  5. 05
    Perform towed array handling operations — streamer deployment and recovery — safely and within the procedure, with the streaming log and depth readouts verified.
    Towed array handling is physically demanding and has real safety hazards — the streamer cable under tension, the handling machinery, the deck position relative to the ship's screw. Do not cut corners on the procedure because the evolution is running late. The streaming log — depth readings at intervals, tension readings, array-straight verification — is the record the work center supervisor signs. A towed array casualty (streamer ingestion, cable parting, depth excursion out of spec) generates a Type Commander message with the handling-space crew's names in it. Know the procedure cold before you touch the handling gear.
  6. 06
    Run a safety-of-ship write-up through the sonar division QA chain — correct MRC reference, system impact statement, applicable NAVSEA technical manual reference, signed by the work center supervisor.
    A safety-of-ship write-up on a sonar system component is not a routine 3-M entry. It changes the ship's readiness reporting, notifies the department head, and may trigger a Type Commander casualty report. Write it correctly: what system is degraded, what the fault is, what the operational impact is (degraded passive detection range, reduced active sonar power, EMSP processing throughput down X%), what the repair timeline is, and whether a workaround exists. The sonar supervisor and the Weapons Officer are both going to read this write-up. Write it the way you would want to read it.

Manuals & References — What Chapters Matter

  • OPNAVINST 4790.4 series — Ships' 3-M Systems Procedures Manual
    The maintenance program you run inside. At STG3 you are signing corrective actions — know the QA provisions governing what a valid corrective action looks like, what a safety-of-ship write-up requires, and what a deferred maintenance entry needs to contain. The work center supervisor will quote the OPNAVINST when he sends an entry back to you; be faster than he is.
  • NAVSEA technical manuals for your ship's installed AN/SQQ-89(V) components — hull sonar, towed array, EMSP, display system
    Your LCPO will assign the applicable volumes to your work center. At STG3 you are expected to use the fault-isolation procedures, not just the operational procedures. The STG3 who can open the NAVSEA tech manual and walk a fault isolation procedure to the component level is the one the sonar supervisor sends to the equipment room instead of waiting for the STG1.
  • NWP 3-21 series — Navy Anti-Submarine Warfare doctrine
    At STG3 you are expected to understand the tactical context of the sonar watch, not just operate the console. Read the applicable volume before you stand your first independent watch — understanding the ASW coordinator's tactical picture (tracking geometry, prosecution procedure, weapon release criteria) makes you a productive watchteam member rather than a screen operator.
  • NAVPERS 18068 Vol II plus the current NEC source-rating NAVADMIN
    Read the STG-series NEC entries and pull the current source-rating NAVADMIN before you tell the LCPO which pipeline you want. The sailor who walks into the NEC counseling having read the source documents makes a credible case. The sailor who is going off what a senior STG told him about a pipeline that was restructured eighteen months ago is setting himself up for a billet assignment based on stale information.
  • NWAE Bibliography for Advancement Exam Study (BIB) for the STG2 cycle — current cycle from MyNavyHR/NETC
    Pull this at pin-on and build a study plan immediately. The BIB is the test — every major topic on the NWAE is represented in the BIB, and the STG3 who works through it chapter-by-chapter with documented notes walks into the exam having already done the work. The LPO who sees the study log approves study time on the watchbill. The one who hears 'I will start studying next month' at three section syncs reads the pattern.
  • OPNAVINST 6110.1 — Navy Physical Readiness Program
    At STG3 the PRT standard is Good Medium or better as the floor the LCPO notices. Good High starts making you invisible at ranking boards. Fail the PRT or BCA and the MILPERSMAN administrative action provisions activate — the STG3 on a fitness improvement program is the STG3 the LCPO is managing instead of advancing.

Standards — How to Hit Each

  • NWAE for STG2 prep documented on the LCPO's timeline — current BIB study log.
    Pin STG3, then pull the BIB for the next advancement cycle within 30 days. Build a study log — notebook or document, chapter by chapter, 45-60 minutes a day, four days a week. Show the study log to the LPO at the next section sync. The LPO who sees documented study progress is the LPO who advocates for study time on the watchbill and mentions your name favorably at the quarterly advancement review.
  • QA-clean 3-M documentation — zero return-for-rework on your closed maintenance actions over a deployment cycle.
    Read every entry you sign before submitting to QA. Ask yourself: does the corrective action match the fault? Is the MRC reference correct? Is the job sequence number right? Is the date accurate? The entry you sign is the entry QA reads. Zero return-for-rework over a deployment cycle is the metric the LCPO uses at eEVAL time to distinguish the STG3 who is actually reviewing his work from the one who is rubber-stamping.
  • Sonar watch qualification earned and current; Surface Warfare (SW) device in progress before the first deployment ends.
    The watch qualification has a timeline and the SW device PQS runs parallel. Work both simultaneously — the SW device PQS covers the ship's warfare areas beyond ASW, and the qualifying signatures come from qualified petty officers across the ship's combat systems department. The STG3 who has both the sonar watch qual and the SW device in progress before deployment is the STG3 the eEVAL ranking calls out favorably.
  • At least one NEC pipeline packet in conversation with the LCPO — not just expressed interest, but a documented counseling entry.
    The NEC pipeline conversation needs a record. Pull NAVPERS 18068 and the current source-rating NAVADMIN, identify two or three NEC tracks that fit the ship's manning needs and your career goals, and ask the LCPO for a formal NEC counseling session. The counseling worksheet entry in your service record is the evidence the next detailer sees when matching your preference card to available C-school quotas.
  • PRT Good Medium or better; BCA in standard.
    Good Medium is the visible floor — below it, the LCPO is managing your fitness instead of your career. Train the run and the push/pull events as a routine, not as a pre-PRT sprint. The STG3 who walks into the cycle having trained consistently is the one who improves; the one who trains for two weeks before the cycle and holds the same score is the one the sonar division chief stops watching for the next NEC slate.

Technical Mistakes — Concrete Consequences

  • Closing a sonar MRC without performing every step.
    An incomplete maintenance action on the AN/SQS-53C transmitter or the towed array electronics is not a paperwork error — it is a degraded ASW capability the ship will discover during a real-world event, and the 3-M system traces the last signature to your name. The Type Commander ASW assessment finding will name the work center; the work center supervisor will trace it to the closed entry.
  • Co-signing a corrective action you observed but did not personally perform.
    Co-signing a job you witnessed is one thing; signing for a job you only heard about in the passageway is a fraudulent maintenance entry. A JAGMAN convened under the OPNAVINST 4790 series will pull the 3-M audit trail, identify every signature on the entry, and the STG3 who signed for a job he did not perform or witness faces separation and a federal record.
  • Calling a biologic as a submarine contact on a live ASW watch evolution.
    False classification starts a prosecution chain — the TAO begins allocating ASW resources, the LAMPS crew may be directed to investigate, and the sonar supervisor's credibility with the ASW coordinator is consumed. When the track dissolves as a biologic twenty minutes later, every person in the watchteam knows who called it. The sonar supervisor will brief it in the post-evolution debrief and the STG3's classification reliability is in question for the rest of the deployment.
  • Failing to notify the watch supervisor when the towed array depth indicator shows an out-of-specification reading during streaming.
    A towed array dragging below its rated depth or running above it creates both a detection performance problem and a mechanical hazard. An array that tears on the ship's screw during a maneuver because the depth excursion was not reported generates a Type Commander message with the handling-space crew's names and the work center supervisor's name. The STG3 who saw the out-of-spec reading and said nothing is the STG3 in the JAGMAN.
  • Posting OPSEC-relevant content about sonar capabilities, towed array configurations, or acoustic intelligence activities.
    Adversary collectors specifically target surface ASW platform information. Federal investigation, separation, possible criminal referral. The career does not survive it. The STG3 paygrade does not change the severity — if anything, the sonar watch qualification makes the OPSEC obligation more acute, not less.

Career Decisions at This Rank

  • Which NEC pipeline to pursue — and making the case to the LCPO before the ship's billet programming locks in someone else's preference
    The NEC decision at STG3 is the most consequential career choice in the rate at this paygrade. The active sonar track (AN/SQS-53C focused NEC) keeps you on the surface warfare picture. The towed array passive track is the longer-range detection side — different operational tempo, different acoustic discipline, and a smaller pool of qualified sailors which translates to better C-school quota priority in some cycles. The advanced ASW system track — working with the LAMPS MH-60R tactical data link and the coordinated ASW picture — is where the billets at surface warfare ASW commands and DESRON staffs live at the senior paygrade. Pull NAVPERS 18068 Vol II and the current source-rating NAVADMIN before you state a preference. The LCPO respects the sailor who has done the reading; the one who says 'whatever the Navy needs' usually gets whatever the ship needs filled regardless of fit.
  • Re-enlistment timing and SRB — sign before or after the NEC pipeline is locked in
    The SRB (Selective Reenlistment Bonus) for STG and STG sub-NECs is published per zone in the current NAVADMIN. The decision to sign before versus after a C-school assignment matters because some NEC sub-rates carry a different SRB multiplier than the baseline STG rate. Talk to the career counselor with the current NAVADMIN in hand — not with a number you heard from a senior STG who signed three years ago. Re-enlist with a clear NEC pipeline and a confirmed second sea tour lineup; the SRB math is secondary to the career architecture.
  • Surface Warfare device — pursue it now or delay
    The Surface Warfare (SW) device PQS is not a hard requirement at STG3 but it is noticed at every eEVAL ranking board the LCPO sits on. The PQS covers the ship's warfare areas — navigation, weapons, damage control, communications — beyond the sonar rate. A STG3 with the SW device in progress or earned before the first deployment eEVAL cycle is the one the LCPO describes as 'invested in the ship' to the department head. The device does not take years; it takes consistent PQS work during the qualifying window.
  • Officer programs — Limited Duty Officer (LDO), Chief Warrant Officer (CWO), or STA-21 — when to start the conversation
    LDO and CWO applications typically open to E-5 and above, with some exceptions, but the preparation starts at STG3 — particularly for the STA-21 (Seaman to Admiral) commissioning program, which has college GPA and SAT/ACT requirements that take planning to meet. If you have any interest in commissioning, tell the LCPO now, start the CLEP/DANTES coursework through the ship's education office, and ask the senior STGs what they know about STG-rate LDO and CWO programs. The window does not stay open indefinitely and the preparation is longer than the application.

How the Seat Varies by Unit Type

  • DDG-51 Arleigh Burke-class destroyer (primary STG3 billet)
    The DDG is where the rate is built. Full AN/SQQ-89(V) suite, LAMPS MH-60R detachment, and ASW as a primary mission area. Maintenance bill is real, watchteam expectations are high, and COMPTUEX / deployment cycles drive the annual calendar. The STG3 on a deploying DDG is getting the operational experience that defines the rate.
  • CG-47 Ticonderoga-class cruiser
    The cruiser's sonar division is larger than a DDG's division and the ship's role as the strike group's senior ASW platform sets a higher standard. STG3s on a cruiser are in a larger watchteam with more senior STGs — more mentorship available, higher performance expectations, and an accelerated qualification timeline compared to a single-ship DDG deployment.
  • Surface Combat Systems Center (SCSC) shore billet
    Some STG3s receive shore billets at SCSC detachments maintaining training systems. Lower OPTEMPO, no sea pay, but depth on the system's configuration that is difficult to get underway. The STG3 who goes to a SCSC billet between sea tours builds technical depth on the AN/SQQ-89 software and hardware baselines; the LCPO will note this in the NEC counseling as an advantage for the next C-school cycle.
  • NTTC Dam Neck shore billet (instructor support or training system maintenance)
    Dam Neck billets for STG3s exist in the sonar training department. Teaching A-School students the rate fundamentals gives the STG3 unusual depth on foundational concepts and builds the presentation skills the LCPO values when the STG3 is eventually running divisional training. Less OPTEMPO than fleet. The STG3 going to a shore billet between sea tours needs to stay current on the operational AN/SQQ-89 baseline — the ship configuration evolves between shore and fleet tours.

What Good Looks Like at This Rank

The good STG3 is the technician the STG2 sends to run the towed array pre-operational check alone, because the procedure will be followed step-by-step and the streaming log will be signed correctly when the watch supervisor checks it. His 3-M documentation closes at QA without rework. His sonar watch station runs at the speed the watchteam expects — contacts called, track data reported, the acoustic picture current — without the supervisor reaching over to adjust the display or fill the silence with the call the STG3 should have made. His STGSN is progressing on PQS because the STG3 corners the STGSN after maintenance evolutions and walks line items. He does not wait for the LCPO to assign formal mentoring — he recognizes that the STGSN's PQS pace reflects on his section's readiness, and he owns it. His own NWAE study log is in a notebook he brings to section sync; the LPO has seen it. The LCPO is already building the case for which C-school pipeline to nominate this STG3 for before the deployment ends. The nomination is not based on who asked loudest — it is based on who has a documented record of clean maintenance work, reliable watch-standing, and a clear pipeline preference backed by having read the source documents. The STG3 who earns that nomination is the one who made the sonar division's readiness metrics cleaner every month he was in the work center.

Preview — The Next Rank

STG2 (E-5) is where the sonar division starts asking you to run a section — not supervise a task, run a section. You will own four to six sailors, write their eEVAL input, manage their PQS progress and advancement study, run the section's maintenance schedule, and be the first technical voice the work center supervisor calls when a system fault comes up during a critical evolution. The LCPO is editing your Chief packet in the back of his mind — meaning the eEVAL ranking against your peer STG2s starts driving whether the NEC pipeline you want, the schoolhouse billet you want, and eventually the Chief board are in your future. The technical depth jumps at STG2. You will fault-isolate from write-up through corrective action on complex sonar system failures — AN/SQS-53C transmitter degradation, towed array depth-control anomaly, EMSP processing chain fault — and brief the result to the ASW Officer in terms the wardroom understands. You are not the technician who executes the fault-isolation procedure under the STG1's supervision; you are the technician who owns the procedure, and the STG1 is checking your work for quality, not guiding it. The NEC you chose at STG3 is now the defining frame for your STG2 work. If you went active sonar, you are the AN/SQS-53C technical authority in your section. If you went towed array, you own the towed array handling space and the passive processing suite. The STG2 paygrade is where the NEC becomes the identity.
FAQ

STG E4 — Frequently Asked Questions

Q01What does a E4 STG (Sonar Technician (Surface)) actually do?
You own a section of the sonar division's maintenance bill — the AN/SQS-53C hull-mounted sonar work center, the AN/SQR-19 towed array handling and electronics section, the sonobuoy receiver suite, or the EMSP/UYS-2 signal processing equipment depending on your ship — and you execute scheduled PMS under the STG2 or STG1's supervision.
Q02What's the most important thing to know as a E4 STG?
STG3 is the first real petty officer paygrade in the rate — the crow means the sonar supervisor puts your name on the watch bill as a qualified watchstander, not as the assistant.
Q03What does a typical day look like for a E4 STG?
Time-blocked day at the E4 STG rank tier: 0500-0600 Reveille. At sea: uniform on, check the watchbill for the day's watch rotation and any pre-watch maintenance requirements. In port: PT gear for morning formation, 0600-0700 Command PT on the flight deck or pier. STG3s run with the division. Underway, this happens on the flight deck weather permitting or in the ship's gym, 0700-0745 Hygiene, breakfast in the mess deck, change to NWU. Pre-watch brief review if you are section lead on the upcoming sonar watch rotation, 0745-0800 Quarters at the sonar division. MRC assignments for the day,…
Q04What mistakes get E4 STG soldiers fired or relieved?
Co-signing a maintenance action you did not personally review. Your initials on the closed MRC are the standard; if QA finds the error on a closed entry you signed without reading, the 3-M audit finding is under your name and the work center supervisor's trust in your review does not recover quickly; Calling a biologic as a possible sub contact on a live watch evolution. False classification starts a tracking chain the TAO has to unwind, wastes ASW resources,…
Q05What career decisions matter most at the E4 STG rank tier?
Which NEC pipeline to pursue — and making the case to the LCPO before the ship's billet programming locks in someone else's preference — The NEC decision at STG3 is the most consequential career choice in the rate at this paygrade. The active sonar track (AN/SQS-53C focused NEC) keeps you on the surface warfare picture. The towed array passive track is the longer-range detection side — different operational tempo, different acoustic discipline, and a smaller pool of qualified sailors which translates to better C-school quota priority in some cycles.…
Q06What's next after E4 for a STG (Sonar Technician (Surface)) in the Navy?
STG2 (E-5) is where the sonar division starts asking you to run a section — not supervise a task, run a section.
Q07What manuals and regulations does a E4 STG need to know cold?
OPNAVINST 4790.4 series — Ships' 3-M Systems Procedures Manual; the maintenance program you run every evolution inside.; NAVSEA technical manuals for your ship's installed AN/SQQ-89(V) components — hull sonar, towed array, EMSP, display system — your LCPO will assign the volumes governing your work center.; NWP 3-21 series (ASW doctrine) — the tactical framework the sonar watch team operates inside; read the applicable volume before you stand your first independent watch.

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Published by the Honest MOS Editorial DeskVerified against DoD/.gov sourcesUpdated May 2026Editorial standards