uint64 timestamp # time since system start (microseconds)
uint8 flight_phase # Estimate of current flight phase
uint8 FLIGHT_PHASE_UNKNOWN = 0 # vehicle flight phase is unknown
uint8 FLIGHT_PHASE_LEVEL = 1 # Vehicle is in level flight
uint8 FLIGHT_PHASE_DESCEND = 2 # vehicle is in descend
uint8 FLIGHT_PHASE_CLIMB = 3 # vehicle is climbing