Skyview to D-180 help

[74-07]

I'm trying to get the gps info from a Skyview to a D-180 so the D-180 can calculate and display the winds aloft. I am using serial port 4 to transmit the info from Skyview. I have connected the blue with orange stripe (TX) wire from Skyview to the input wire of D-180 which was existing from and successfully used with the EKP-IV that has since been removed. Serial port 4 settings are:
NMEA OUT - Full
Serial in/out rate - 4800

The D-180 is computing winds and displaying them but they don't agree with either the direction and speed that the Skyview is displaying. I am confident that the Skyview is the accurate one.

Any ideas?

Thanks

[rvbuilder2002]

Wind direction and speed calculations require accurate magnetic heading info.

If the mag inclination and calibration haven't been done for the D-180 it would be unable to do a valid computation.