September 13, 20214 yr I am using the 172 and the B58. I load my flight plan. Once airborne I engage the AP with HDG and everything is fine. The ALT is working as well. There are no DIS or ETE numbers displayed. I engage NAV and then the FPL disappears and is replaced with the following…+45-75. The 530 stops tracking along the route. HDG still works. I am at a loss. Everything was working fine. I updated to the GNS 750. I also upgraded air manager to the 4.0. BTW all my testing was done with out the AM running. thanks for the help in advance.
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