I'm running 5.4 and continue to have this problem in my RV9A and D100. Normally it occurs about once every 30 minutes but last Monday on a XCountry return trip it stated loosing the GPS Nav source every 2 minutes, literally! I then reconfigured the GPS AvMap IV to send updates at 9600 baud rsther than 4800. Also reconfigured the D100 from auto baud rate to manual, 9600 baud. The AP then worked OK for next 15 minutes until the flight ended. I doubt if chaning the baud rate really fixed anything, just altered behavior a bit.
Now I'm going to whine a bit. This has been an ongoing problem since the AP was released, i really think it should have been solved by now. I know Dynon would like to reproduce the behavior on the bench in a controlled environment to fully understand the failure and make a good fix BUT that simply isn't always possible. I really think, some educated guesses are called for, increase some parameters, lower some tolerances, increase retrys, it appears the behavior has not changed one bit since the release of the product.
Finally, PLEASE add an audio alert when the AP looses the NAV source and switches to track mode. When flying cross country most pilots do not stare at the EFIS and do not become aware of loosing NAV source until they notice they are significantly off course. I really think an audio alert is called for.
Now I'm going to whine a bit. This has been an ongoing problem since the AP was released, i really think it should have been solved by now. I know Dynon would like to reproduce the behavior on the bench in a controlled environment to fully understand the failure and make a good fix BUT that simply isn't always possible. I really think, some educated guesses are called for, increase some parameters, lower some tolerances, increase retrys, it appears the behavior has not changed one bit since the release of the product.
Finally, PLEASE add an audio alert when the AP looses the NAV source and switches to track mode. When flying cross country most pilots do not stare at the EFIS and do not become aware of loosing NAV source until they notice they are significantly off course. I really think an audio alert is called for.