Navy NEC · Support

T21A Submarine Assistant Navigator (ANAV)

Current service use not established

This code is listed in the directory. Inclusion alone does not confirm current service use.

A Navy Enlisted Classification: a skill designation sailors hold in addition to their rating.

Overview

Submarine assistant navigators assist the Navigator with the safe navigation of the ship while at sea. When assigned ashore, they coordinate submarine routing and operations, prevent mutual interference, and support the safety of submerged operations.

Core Skills

  • Submarine routing and operations coordination
  • Mutual interference prevention in submerged operations

Civilian Career Paths

Career associations are editorial assessments of the cited evidence, not an official crosswalk unless the evidence explicitly says so. O*NET supplies civilian occupation information, not proof of a military match. Related experience does not confer civilian qualifications. Tasks and tools below describe civilian work, not military training.

Merchant Vessel Mate

Assisting the Navigator with safe ship navigation and coordinating submarine routing transfers directly to vessel movement planning and navigational safety.

How to prepare: Obtain an official sea-service transcript or assignment history, with vessel particulars, underway time, and assigned duties, for Coast Guard evaluation against a target mate endorsement; a DD-214 is not acceptable sea-service evidence. Entry requires the applicable MMC officer endorsement and generally a TWIC, with Coast Guard approval of qualifying sea time, training, professional competence, medical fitness, citizenship, and drug testing; open-ocean service also requires applicable STCW training and endorsement.

What the civilian work involves
  • Direct courses and speeds of ships, based on specialized knowledge of local winds, weather, water depths, tides, currents, and hazards.
  • Prevent ships under navigational control from engaging in unsafe operations.
  • Consult maps, charts, weather reports, or navigation equipment to determine and direct ship movements.

Notes & Sources

Evidence for this guidance (7 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC T21A

    [1] NEC entry "T21A - Submarine Assistant Navigator (ANAV)"; cached text line 10652; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Submarine routing and operations coordination, Mutual interference prevention in submerged operations, Merchant Vessel Mate (O*NET 53-5021.00)

  2. O*NET: Captains, Mates, and Pilots of Water Vessels

    [2] O*NET 30.3 occupational data

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

  3. USCG National Maritime Center: Military to Mariner (military sea service credit)

    [3] Military Service Requirements section; public page retrieved through Jina Reader 2026-09-23

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

  4. USCG National Maritime Center: Apply for Merchant Mariner Credential

    [4] Original, Raise of Grade, and STCW application steps; public page retrieved through Jina Reader 2026-09-23

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

  5. USCG: 46 CFR 10.232 military sea-service evidence and credit

    [5] Paragraphs (a) and (d)(1), official eCFR snapshot September 21, 2026; retrieved September 24

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

  6. USCG: 46 CFR 11.201 officer-endorsement requirements

    [6] Paragraph (a), official eCFR snapshot September 21, 2026; retrieved September 24

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

  7. Bureau of Labor Statistics: Water Transportation Workers

    [7] How to Become; training, licenses and related experience; updated August 27, 2026, checked September 23, 2026

    Supports: Merchant Vessel Mate (O*NET 53-5021.00)

Defense contractor jobs for T21A

Similar Specialties

Similarity is a browsing aid, not documented equivalence or transfer eligibility.

Descriptions may be summarized for clarity. Verify all information with your branch career counselor or official military documentation before making career decisions.

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