I just fired up my instrument panel (Glasair) for the first time and I can't get the heading to show on the D10. it is in my garage. Everything else works fine.
To calibrate the EFIS-D10 you do need the PC laptop. However, if you want to view the heading tape in its uncalibrated state you simply navigate in the EFIS-D10 menu to the SETUP , and then CLUTTR submenu.