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★★★★★
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Where this app stands in Spain, updated 11 Nov 2026
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Now also in Portuguese, German and Italian.
How should I trim my sails in this wind? Sail Trim tells you in seconds. Drag the wind around the boat (or enter your heading and the forecast wind) and the app shows you: • Your point of sail: close-hauled, close reach, beam reach, broad reach or running, and your tack. • A drawing of the boat with the main and genoa set as they should be. • Mainsail: sheet, traveller, vang, outhaul, cunningham, backstay and preventer. • Genoa: sheet, lead car, halyard and how much to furl. • Telltales: what each one is telling you and what to do about it. • Reefing: how many reefs for the wind strength, your boat length and your point of sail. • Safety tips: heel, gybing, goose-winging, gennaker and light air. Made for cruising skippers with a main and genoa, for anyone learning to sail, and for anyone who sails with friends and wants to do it better. Works offline, asks for no permissions and collects no data. In English, Spanish, French, Portuguese, German and Italian. An app by SailVoyager: sailvoyager.com This is general advice: always adapt it to your boat, the sea state and your experience.