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533 - ATPL - Some inertial reference and navigation systems are known as strapdown. This means that:

Question 533 - General Navigation - ATPL - Airline Transport Pilot license

The gyroscopes and accelerometers become part of the unit's fixture to the aircraft structure
Gyros and accelerometers need satellite information input to obtain a vertical reference
Gyros and accelerometers are mounted on a stabilised platform in the aircraft
Only the gyros, and not the accelerometers, become part of the unit's fixture to the aircraft structure

Training tests and timed exam simulations ATPL - Airline Transport Pilot license