Tips: I advise to extend your screen idle timer. Also set Return to Clock to after 1 hour. Settings->General-> Return to clock You can use bluetooth earphones if the volume is not loud enough. Enable background refresh Settings > General > Background App Refresh This app uses GPS and may impact the battery life. A 10-15% battery drain per hour is normal. Future features: Spoken wind shift messages OCS alarm Manually set Windward and leeward mark Battery optimization (turn off GPS automatically) The following permissions are needed Healthkit: To start a sailing workout. This is also needs to get timer updates and location updates when the screen is off. Location: To plot your route on the map and to calculate the distance to the line