Maritime Master - OOW

Study faster. Sail safer.

Practice radar plotting, run bridge calculations, and master COLREGs, all in one app built for OOW prep and day-to-day reference. Designed for deck cadets, maritime students, and working officers (OOW, 3/O, 2/O).

Radar plotting simulator:
Add multiple targets with custom courses and speeds
Automatic CPA/TCPA with clear high-risk warnings
Relative motion vectors and target trails to visualise situations
Training disclaimer: This simulator is for education only and must not be used for real-world navigation or collision-avoidance decisions.

Calculation suite:
Navigation: Speed–Time–Distance, ETA, Dead Reckoning, Course & Distance (Rhumb Line & Great Circle), Set & Drift & Fix Position
Terrestrial & Celestial: Compass Error, Parallel Indexing, Object Distance, Advance & Transfer, Meridian Passage & LOP sight-reduction helper
Stability & Ship Construction: FSE correction, Mean Draft, TPC/LCF usage, Trim & VCG
Meteorology: True Wind, Barometer corrections, Beaufort scale converter & Tides and Currents

Essential learning & reference library:
Regulations: SOLAS, MARPOL, STCW, ISM Code, ISPS Code, GMDSS (quick-reference guides)
Core nautical knowledge: Passage planning; ECDIS & charts; basic stability; compass deviation
Procedures: Emergency procedures; SOPEP & SMPEP; checklists for safe watchkeeping; logbook entries; equipment handover
Electronic navigation: AIS data interpretation; ECDIS functions; AIS/MMSI code reference

Master the Rules of the Road (COLREGs):
Shapes and sound signals
International Code of Signals (ICOS)
IALA buoyage systems (A & B)

Test yourself & prep for exams:
Flashcards, ICOS Hangman, and a Buoy Night-Light game
OOW progress tracker.

Who is it for?
Maritime students & deck cadets: build a strong foundation
Officers in training: prepare confidently for OOW certification
Active deck officers: quick reference, calculation practice, and knowledge refreshers
Anyone who wants to learn more about maritime and OOW

Download Maritime Master - OOW and advance your maritime knowledge with confidence.

Every six months, we review all app content to ensure it is up to date and correct. We work throughout the year to fix bugs and issues, but this is the time we focus on learning content and make sure it is accurate and up to date for all our users.