Graeme Cant wrote:
Since a sealed-by-an-OO barograph is accepted by the IGC as completely
adequate security for all purposes, why do we need heightened security
for GPS loggers used for those same purposes?

A sealed barograph has not been acceptable for world records for a
number of years, and is only acceptable with additional evidence (i.e.,
photographs and/or landing statements) for badge distance legs. The
additional security required of approved flight recorders was a direct
response to the perceived insecurity of barograph/camera documentation
for world records (the result of a number of known cheating incidents).

Marc