Can I use PowerFLARM Fusion or Portable in an aircraft with pressurized cabin?

PowerFLARM devices contain a pressure sensor (see also What is the pressure sensor used for?), which obviously won't produce correct readings in a pressurized cabin. PowerFLARM can still be used in these aircraft with the following provisions:

1. Either
1. 1090 processing is deactivated, or
2. the aircraft is equipped with a Mode-S transponder. In this case, PowerFLARM will use the pressure altitude from the Mode-S signal. This is enabled by default (see below). Make sure the transponder type and aircraft address are configured correctly.
   
   The settings in the online configurator look like this (make sure Advanced settings are shown):
   
2. The pressure altitude recorded in the IGC file will not be correct. The IGC file still contains the correct GNSS (geometric) altitude, so this is not an issue in most cases.