RTL_ALT_TYPE is above terrain waiting for terrain
This issue occurs when terrain data is not loaded onto the vehicle, the sd card is corrupt, or the terrain data files are too large
If this error occurs you can download the correct data from here
If this does not solve the issue,
Take SD card out of UAV
Reformat to Fat32
Reinsert into UAV
Take SD card back out of UAV
Put terrain data on SD card
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