Altitude data loggers are available (baro pressure) which log automatically log date/time and data. Various versions from different suppliers. I use this one in testing along with some of their accelerometers along with other manufacturers products. Unpressurised, they accurately can determine altitude.
GCDC B1100-1 Barometric Pressure Data Logger
with a GPS logger, these would be fairly handy in future photo ops at least to get rid of the stress of nonsense accusations.
GPS alt is so so stand alone, but better than nothing.