I just sailed on a boat where we had a electrical failure. As a contingency plan I got my mobile phone set up as a gps, linked it with the laptop through bluetooth and set that bluetooth port up as a NMEA0183 source. So far, so good. 

However, is there a possibility to fake a wind speed and wind direction? If it was, it would be possible to get most numbers working (including targets, what-ifs etc) and enable you to find your way around the course and survive the day.

Does anyone know how to do this?

The simulate option could possibly cover this, if it was possible to exclude boatspeed and heading from the simulated values. One would instead get the position, course and speed from the mobile phone gps as I intended to do. ...but before making a feature request, I thought I check if there is a workaround.