2021-09-02, 06:48 PM
Those are bugs, clearly the plugin overlay has not a lot of use. Thanks for reporting this I will correct it.
The advantage to compass mode is first that gps is not required. Otherwise it may be useful in some cases for example, if you dont have a wind sensor and the wind direction is stable enough but there are changing currents and or changing wind strength. With compass mode the wind angle would remain the same and course over water would be constant because the boat would point the same direction. As the current shifts and wind speed changes, the course over ground would change and following a gps course would cause the wind to shift. This could be for example in a current about as strong as the boat speed with variable wind, and sometimes the boat is moving backward or sideways over ground then sometimes the wind increases and you move forward, in this case gps will turn the boat around.
Another example may be if the gps is giving very poor/incorrect data.
The advantage to compass mode is first that gps is not required. Otherwise it may be useful in some cases for example, if you dont have a wind sensor and the wind direction is stable enough but there are changing currents and or changing wind strength. With compass mode the wind angle would remain the same and course over water would be constant because the boat would point the same direction. As the current shifts and wind speed changes, the course over ground would change and following a gps course would cause the wind to shift. This could be for example in a current about as strong as the boat speed with variable wind, and sometimes the boat is moving backward or sideways over ground then sometimes the wind increases and you move forward, in this case gps will turn the boat around.
Another example may be if the gps is giving very poor/incorrect data.