Curious incident today, uncontrolled airspce between Gardemoen ENGM and Oslo City. Two separate SD 's running in iPad simultaneously lost satellite fix. One is internal GPS, the other a bluetooth dongle. Both we're working normally after landing (10 mins later). Panel mount 430 unaffected.
What would cause this? There were no radio changes in this period. Maybe someone in Norway knows a reson?
GPS dropouts are known to happen in Norway, some due to rock formation, others by terrain. You should file a report with location and time to
GPS.gov: GPS Service Outages & Status Reports . What they don't know, they can't fix.
If I remember correctly even a notice for the unreliability of GPS in certain areas of Norway is in their AIP.
As sensitivity of the panel GPS is better, I would expect to fail the iDevices first.