How is this supposed to work
I made the changes, thinking that by sending computed speed to the TDC, it would also send the computed target heading. But it doesn't seem to work that way. After clicking on the little watch, checking that the computed speed and heading were accurate, and then clicking on the "send" icon, the computed speed shows up on both the TDC and the speed dial ... but the target heading (TDC) and AOB (dial) remain unchanged from their original positions.