I have ordered this new wireless wind transducer
(delivery coming march or April), and I have a question about using it with OpenCPN
The transducer transmits apparent wind
speed and direction via Bluetooth Smart protocol (BT4.0 low energy mode). It comes with no display console - I plan to use OpenCPN
exclusively to display the data.
The transducer is totally free-standing, so it has no connection to GPS
or paddlewheel for SOG or SOW. So there is no way it can calculate actual wind
speed/direction when the boat is moving - it will only transmit apparent speed/direction.
I was hoping to display both apparent and true wind speed, but after reading some issues with the latest release candidate it appears that OpenCPN expects to receive true wind speed though NMEA
in order to display it. Is this true?
And if it is true, would it be possible to modify the Dashboard plugin to provide the capability to calculate the true speed/direction from the apparent speed that the wind transducer provides and from the SOG/COG that the GPS
provides? The vector math is simple, we just need to do it.
What I would envision is a few new "gauges" added to the Dashboard. Whereas there are now dials for "Apparent" and "True" speed/direction, there would be a new ones for "Calculated True" speed/direction. Or, perhaps the dashboard cal
look for NMEA
sentences for true speed/direction, and if it does not find them, it will automatically calculate them. Or maybe it already does this?