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Navy NEC · Support

T21Q Qualification Card Completion SSN/SSGN/SSBN 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.

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Overview

Assistant navigator qualification card personnel track each member’s completion of the required SSN, SSGN, or SSBN assistant navigator qualification card. They certify and train personnel in lookout duties, periscope operation, radar contact detection and reporting, contact management, collision avoidance, port entry planning, and piloting, strait transit, and voyage planning briefs.

Core Skills

  • Radar contact reporting and collision avoidance
  • Port entry and strait transit briefings
  • Navigation watchstander training and certification

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.

Sailors and Marine Oilers

Qualification to train and certify ship lookouts directly overlaps the deck-watch duties within this occupation, rather than its engine-room work.

How to prepare: Use the National Maritime Center checklist for an entry-level deck credential to identify the documents and assessments needed for an original application.

What the civilian work involves
  • Stand watch in ships' bows or bridge wings to look for obstructions in a ship's path or to locate navigational aids, such as buoys or lighthouses.

Deck Mate

Port-entry planning, voyage briefings, radar contact reporting, and collision-avoidance training overlap a deck mate's navigation and vessel-safety duties.

How to prepare: Request an official sea-service transcript or assignment history with vessel particulars, routes, underway time, and assigned duties for Coast Guard evaluation; a DD-214 is not accepted as sea-service evidence. Officer endorsement requires Coast Guard acceptance of experience, approved training, professional competence, age, citizenship, character, physical health, and drug-testing qualifications.

What the civilian work involves
  • 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

  • Most water transportation jobs require a TWIC and a Merchant Mariner Credential with appropriate endorsements; requirements depend on the position and service.
  • Open-ocean service requires USCG-verified STCW training, and an STCW endorsement generally requires the corresponding national endorsement.
Evidence for this guidance (8 documents)
  1. NAVPERS 18068F Vol II (NEOCS, Jul 2026 edition): NEC T21Q

    [1] NEC entry "T21Q - Qualification Card Completion SSN/SSGN/SSBN Assistant Navigator (ANAV)"; cached text line 10693; NAVPERS 18068F Vol II, 2026-07 edition

    Supports: Radar contact reporting and collision avoidance, Port entry and strait transit briefings, Navigation watchstander training and certification, Sailors and Marine Oilers (O*NET 53-5011.00), Deck Mate (O*NET 53-5021.00)

  2. O*NET: Sailors and Marine Oilers

    [2] O*NET 30.3 occupational data

    Supports: Sailors and Marine Oilers (O*NET 53-5011.00)

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

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

    Supports: Sailors and Marine Oilers (O*NET 53-5011.00)

  4. Bureau of Labor Statistics: Water Transportation Workers

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

    Supports: Sailors and Marine Oilers (O*NET 53-5011.00), Deck Mate (O*NET 53-5021.00)

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

    [5] O*NET 30.3 occupational data

    Supports: Deck Mate (O*NET 53-5021.00)

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

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

    Supports: Deck Mate (O*NET 53-5021.00)

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

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

    Supports: Deck Mate (O*NET 53-5021.00)

  8. USCG: 46 CFR 11.201 officer-endorsement requirements

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

    Supports: Deck Mate (O*NET 53-5021.00)

Defense contractor jobs for T21Q

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