There is a LONG LONG way between using it on the ground in a quite unmoving enviroment to using it in a bucking Aircraft at night in cloud.
I suggest you take it for a spin in an aircraft into cloud and see how you go.
A HANDHELD GPS, OF ANY TYPE, IS NOT DESIGNED TO GIVE ATTITUDE INFORMATION to enable the pilot to fly in cloud.
With all due respect my friend I suggest you stick to fixing the aircraft and we will fly em......ok?