Navi Control Flags ( source: uart1.h ) :

||  '''Bit''' || '''When''' ||
|| 0    || Free ||
|| 1    || Position Hold ||
|| 2    || Coming home ||
|| 3    || Range Limit ||
|| 4    || No Serial Link ||
|| 5    || Target Reached ||
|| 6    || Manual Control ||
|| 7    || GPS OK ||


This could be interesting for you too: [[en/FCFlags|FCFlags]] [[en/NaviDataStruct|NaviDataStruct]]