Sailing Calculator

Sailing upwind means you can't go straight to your destination — you have to tack. Sailing Calculator does the math for you: enter your destination and wind direction, and get the optimal tacking route in seconds. Built for recreational sailors who want a fast, reliable way to plan a route without pulling out a paper chart and protractor mid-race or mid-cruise. KEY FEATURES - Tacking route calculator — automatically finds the optimal tack angles and route legs upwind, with 1, 2, or 3 tacks and instant route mirroring to avoid obstacles - Manual route planning — build and save your own custom route when you want full control - Live & forecast wind data — pulls current wind direction and multi-day forecasts so you can plan ahead, not just react - On-boat calibration — calibrate your boat's dead angle and wind direction directly from compass headings on each tack - Drift calibration — fine-tune your route calculations to account for current and leeway - Offline maps — download chart areas before you leave the marina; the app works fully offline once cached, with no signal needed on the water - GPS-based real-time positioning — see your position and course live as you sail - Remembers your setup — settings and routes are saved automatically between sessions - Available in English, Polish, and German WHY SAILING CALCULATOR Most navigation apps are built for motorboats or general cruising and treat tacking as an afterthought. Sailing Calculator is built around exactly one problem: getting from A to B when you can't sail there directly — with the flexibility to plan manually or let the app calculate the optimal route for you. WORKS WHERE YOUR SIGNAL DOESN'T Once you've cached your charts, route calculation and map display work with no internet connection. Live wind data needs a connection when you request it, but your planned route and saved settings are always available offline. REQUIREMENTS Android 8.1 or newer. Location permission is required for real-time positioning and route calculation. PRIVACY Sailing Calculator does not collect, store, or share any personal data on any server. Your location is used on your device to calculate your route and, when requested, to fetch wind data for your position. Full privacy policy available from within the app. Questions, feedback, or feature requests? We'd love to hear from you.