The navigator would be looking at a screen displaying ECPINS Submarine[1] or similar software. The inputs they'd be able to use would include: 1. GNSS locatio

The navigator would be looking at a screen displaying ECPINS Submarine[1] or similar software. The inputs they'd be able to use would include: 1. GNSS location (only if surfaced) 2. Passive sonar data (detecting location of electromagnetic signals through water e.g. acoustic noise of another ships propeller) 3. Active sonar data (only if stealth is unnecessary) 4. Radar data (only if surfaced) 5. Bathymetry models/charts[2] (accuracy depends on location in the world) 6. Tide prediction models[3] (availability is location dependent) 7. Inertial navigation sensors (dead reckoning so accuracy drifts over time) 8. Surface Electronic Support Measures sensors (allows geolocation of signals from other ships, aircraft and ground transmitters) [1] https://osimaritime.com/solutions/software/ecpins-submarine/ https://osimaritime.com/solutions/software/ecpins-submarine/ [2] https://www.admiralty.co.uk/digital-services/digital-charts/admiralty-vector-chart-service https://www.admiralty.co.uk/digital-services/digital-charts/... [3] https://www.admiralty.co.uk/publications/admiralty-digital-publications/admiralty-totaltide https://www.admiralty.co.uk/publications/admiralty-digital-p...