Folks, after a bit of experimenting we've discovered that INS/DL issues are occuring (occasionally) while startup is performed inside the hanger. It's easy enough to correct, and if necessary for INS it can be performed in flight. Once the throttle geso idle and warning lights are off, pulling forward to expose the full canopy glass seems to be enough to turn GPS off and on and get the signal. If INS is hosed it can always be realigned in flight. Thanks for the feedback!
