Offline
Navigate and calculate offline — nautical app for skippers
Offline-first — not offline-only: calculators and logbook local; live data only if you want it.
Signal is not plan B
At sea, signal often drops exactly when you need to recalculate course, variation or ETA.
Offline without compromise
- ·Course correction, variation, ETA, conversions
- ·Logbook, GPS, export
- ·Offline tides (~1,000 stations)
- ·No account, no cloud sync by us
What is not offline
Live weather and worldwide online tides via Stormglass, OpenWeather, WorldTides — with your API key in the keychain.
Backup navigation
Aid — does not replace certified equipment or charts.
Frequently asked questions
No — honestly: calculators and logbook yes; live weather/tides optional with network and key.
Related topics
Start offline
One-time purchase