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Hello,

Sailor for 30 years, last November, I was making my first transatlantic!! How many memories...
But during these 15 days, I would have needed an app to see if the action of a trim (sheeting, easing, bending the mast, digging the sail, raising the tangon, ...) is positive or not.

So back, I created an Android Application: SailFreeGPS for smartphones or tablets that displays graphics with speed and course history. You can thus see if the new trims are positive or not (despite the waves, gusts or calms).

In addition I have created a page displaying COG, SOG, magnetic compass and current Position.

https://play.google.com/store/apps/details?id=com.frederic.sailfreegps

Moreover, since the values from the GPS are too fluctuating on our smartphones (while we advance to 6 kt stable, speed fluctuates from 4 to 8 Kt), I added a "filtering function" (average of a number of points that you can adjust).
You can also adjust how many past you want to see (from 30s to 20min)

I also added a Man OverBoard (MOB) function which will lead you to the MOB position using a graphical displaying.
SailFreeGPS also handle a night mode and allows you to share your position, Cog, SOG using one of the app installed on your device: SMS, e-mail, Facebook, WhatsApp, Snap, ….

Do not hesitate to provide me feedbacks or suggestions: [email protected]

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Fred.
 

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Interesting, I downloaded it and took a quick look at the features. I like the graphing feature to measure performance. I played with the settings a bit and it seems the longest graphing period is over a 20 minute period?

It would be nice if it had (or maybe it does) a logging feature so you could save and analyze the data at a later date.

I won't get a chance to field test it until next week end. I will try and report back after testing it out.
 

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Interesting, I downloaded it and took a quick look at the features. I like the graphing feature to measure performance. I played with the settings a bit and it seems the longest graphing period is over a 20 minute period?

It would be nice if it had (or maybe it does) a logging feature so you could save and analyze the data at a later date.

I won't get a chance to field test it until next week end. I will try and report back after testing it out.
Yes, SailFreeGps only propose to display information from 30s to 20min
Fred
 

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I used it the other day on a quick 2 day trip.

The graph is very small and hard to see. To expand it one needs to drop the time from 20 minutes to lower. It would be nice to spread it with fingers.

20 minutes is long enough for tracking but not long for currents on a 2 day trip. It would be nicer if it was 24 hours.
 

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I tried it today, but found I couldn't really see it that well while I was trying to sail the boat.

But I have a sailing kayak so a bit of a funny nav set up where my electronics go in a soft sided clear chart case on my foredeck in front of me. So it's a bit tough to see a cell phone screen at the best of times because of the angle.
 

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Is there an actual smart phone app... or only a web site? On a large PC monitor the information is interesting.
You might want to shade the hours when the sun is down... as this is useful when planning long trips for those who prefer to sail in daylight.
 
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