SailFreeGPS icon


Sail trim optimizer : analyse your trim effect on your speed or course

2.2.2 for Android
4.4 | 1023 Reviews
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The explanation of SailFreeGPS


I am an amateur sailor who has decided to create this app during a Transatlantic cruise.
I add periodically functionalities to this app when I have some free time.

✓ SailFreeGPS displays current position, course (COG), speed (SOG), max speed, Trip distance, speed average and magnetic compas.
✓ SailFreeGPS displays COG and SOG history (6h) to help you to see trim effect on your sails.
✓ SailFreeGPS filters GPS information for more accuracy average of an amount of last measure you can set).
✓ SailFreeGPS can share your position, COG, SOG to your friends.
✓ SailFreeGPS helps you during Man OverBoard manoeuvre (MOB). It store the position and lead you to it.
✓ SailFreeGPS display your track on google map (24h).
✓ SailFreeGPS helps you during Regatta with its countdown timer and its departure line
✓ You can store up to 5 waypoints and activate a GOTO function with ETA (Estimated Time to Arrival computation)
✓ You can convert your track to GPX/KML file
✓ You can use it on every boat, motor or sail boat.
✓ You can now activate an anchor alarm or a course alarm.

Compass is a very tricky sensor, some time not accurate or some time just not calibrated. In this case, just consider

Please send me an email for any question or problem : [email protected]

Not available on iOS

Encourage me to continue by subscribing to premium version.

List of features of Premium Version

Premium version DOES NOT CONTAIN ADS.

✓ Doucle click on SPEED will reset trip, max and ags speed
✓ Long click on COURSE to display compass
✓ Double click on coordinates to display/hide position

Graph Tab:
✓ Double click COG graph to switch to full screen mode

MOB Tab:
✓ Displays of relative bearing of the MOB
✓ Displays of tack angles
✓ Double click graph to switch to full screen mode

Waypoint Tab:
✓ Up to 100 Waypoints
✓ Displays of relative bearing of Waypoint
✓ Displays of tack angles
✓ Double click graph to switch to full screen mode

Map Tab:
✓ Displays of SOG and COG (speed & course)
✓ Your track segments are displayed according to your speed

Anchor alarm:
✓ Anchor area can be a polygon and you can adjust its shape

Regatta Tab:
✓ "Gun Button" allows to round seconds to nearest minute
Ex: 4:03 => 4:00 or 3:58 => 4:00
✓ Displays of time to kill/save continuing the same way (speed and course)
✓ Displays of ideal speed to cross the line at 0:00 on the same course!!!

Settings Tab:
✓ Displays reverse color (white on black back)
✓ You can select Hybrid map
✓ Select on which duration is calculated the speed scale of your track: last 5min, 15 min or all the track
✓ Select your tack angle value. It will be displayed on MOB and WAYPOINT tabs

✓ Ask to save the track before Exit

SailFreeGPS App 2.2.2 Version Update

Jun 28, 2020
New COURSE control alarm
New map "Terrain"
New swiping tabs buttons (now configurable)
Adjust distance from boat front to your GPS location on boat for to improve regatta departure accuracy.
Export Waypoint Fix

Additional App Info

Operating System: Android
Category: Sports
Publish Date: Jan 20, 2019
Latest Version: 2.2.2
Min Installs: 100000
Installs: 100,000+
Size: 7.8M
Requirements: Android 4.1 and up
Offers In-App Purchases: true
Contains Ads: true
Price: Free
Report: Flag as inappropriate
App uploaded by: Individual
Available on: Google Play Store

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Rating And Reviews

sajin ray ray 5
Jun 24, 2020 US

மிகவும் நல்ல பலனை கொடுக்கும் வகையில்உள்ளது. நிறைய பேருக்கு இது உதவும் நன்றி நன்றி நன்றி

Helpful Report
Kevin Smith 5
Jun 30, 2020 US


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Mikayal Francis 5
Jun 29, 2020 US


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kaure Kaan 5
Jun 26, 2020 US

My best

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Ramesh kumar 5
Jun 26, 2020 US


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Isante Magalona 5
Jun 25, 2020 US

This app is lifesaver especially for a Fisher man like me.. Is this app is free? Do i need to pay monthly or subscribe?

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