Professional Math Tools for Pilots and Deck Officers
Nav Numbers is a fast, reliable toolkit of marine calculators built for real-world bridge work. Get the numbers you need quickly—from Rate of Turn to UKC—without scratch math or complex spreadsheets.
Built by mariners, for mariners. Accessible anywhere, even offline on your mobile device.
The Professional Toolkit
A complete set of practical calculators optimized for day-to-day pilotage and bridge operations.
Maneuvering
Rate of Turn · Turn Transfer
Swept Path · RPM Calculator
Safety
UKC / Squat · Air Draft
Anchor Swing · Heel/List Draft
Built to be fast, clear, and reliable when it matters most.
Planning
ETA · Speed/Time/Distance
Course to Steer · Watch Schedule
Environmental
True Wind · Windage
Anchor Swing Circle
Nav Numbers is easier than a spreadsheet and faster than a calculator
Nav Numbers Free
Essential tools for every bridge officer. Start using 5 professional tools immediately. No account required.
- Anchor Swing Calculator
- Unit Conversions
- Estimated Time of Arrival (ETA)
- Speed / Time / Distance
- True Wind & Velocity
Nav Numbers Pro
Every calculator in the Free version PLUS:
- Air Draft
- Course to Steer
- Heel / List Draft
- Rate of Turn
- New RPM
- Squat / UKC
- Swept Path
- Turn Transfer
- Watch Schedule
- Windage and Force
Start using the free tools now and upgrade for the full Pro toolkit.
Add Nav Numbers to Your Home Screen
Nav Numbers works like an app on your phone or tablet. For the full offline experience, add it to your home screen:
Once installed, Nav Numbers launches like a native app—full screen and ready for use on the bridge.