One thing that hsn't really been mentioned is the requirement that you
also have a barograph on board for badges and records if you use a
position recorder instead of a flight recorder. Judy, The Badge Lady,
verified the requirement during her presentation at the SSA
Convention. The barograph must also be calibrated. If you alredy have
a barograph or can find a cheap used one, the cost would be low. If
you had to buy a new one at $350-$600, it wouldn't make sense. The
total cost would approach an approved flight recorder.

Charlie