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Bought subscriptions are automatically renewed.

To cancel a subscription:

1. Open the Google Play Store  .
2. Tap Menu  Account  Subscriptions.
3. Find the subscription you want to cancel.
4. Tap Cancel.

To make sure that the app will always remain active:

• Put the device on charge
• Do not turn off the screen, its brightness will automatically be dimmed to the minimum. If the screen still turns off, go to the Android Settings/ Display / Sleep menu and check “Never” if the option exists.
• Check that you have good GPS reception.

In addition to the gpx files created in the sailgrib/track_aa directory, the track is saved in a database. The app uses the latter with a much faster access.

To delete old points from the displayed track , go to the menu and press the button. By default the last hour will be kept.

If you have subscribed to the Premium option, you can set the duration of the track to be displayed when the button is pressed: from 0 to 24 hours.

The blue circle gives an idea of the accuracy of the boat’s position. The boat has 95 pct chance to be inside the circle. It is visible when the map is highly zoomed.

The position accuracy is derived from the hdop (Horizontal Dilution of Precision) parameter calculated by your phone’s GPS chip.

With our cellphones, in open sea, the accuracy is generally around 5 meters.

If you have a phone that picks up the Galileo constellation, you will have an accuracy to the order of the meter. You can view the list of Galileo compatible phones here.

As of Q3 2018, the new cellphones should be equipped with precise GPS, with an accuracy around 30cm…

The position accuracy is derived from the hdop (Horizontal Dilution of Precision) parameter calculated by your phone’s GPS chip.

With our cellphones, in open sea, the accuracy is generally around 5 meters.

If you have a phone that picks up the Galileo constellation, you will have an accuracy to the order of the meter. You can view the list of Galileo compatible phones here.

As of Q3 2018, the new cellphones should be equipped with precise GPS, with an accuracy around 30cm…

In the meantime, you can use an ultra-precise Bluetooth GPS receiver for Galileo satellites and supporting EGNOS technology in Europe or WAAS in the United States. You will obtain an accuracy well below the meter. The best today is the GNS2000 Plus.

To use it, you need to:

• load an application such as  Bluetooth GPS
• Allow the Developer options: in the Android menu, go to: Settings / System / About the device / Tap up to seven times the build number to unlock the Developer options.
• In Developer options / Select mock location app menu, select Bluetooth GPS as the mock location provider.

The GPS needs a clear view of the sky to calculate an accurate position.

• No if you are in your living room, it is likely that your position will be unreliable. The application filters the positions and keeps only those positions whose accuracy is less than a threshold of 15 meters by default? Your position probably won’t be refreshed.
• Yes if you are outside. Always make sure to have a clear view of the sky.