The Pressure Altitude and Cabin Pressure instruments display pressure altitude as measured by a barometric pressure sensor. Key differences and behaviors depend on the source of the data:
- Internal iPad/iPhone Sensor
- Cabin Pressure will display a value.
- Pressure Altitude will not display any value.
- External Device with a Barometric Sensor (e.g., Sentry)
- Both instruments will display the same value.
- The Pressure Altitude instrument will show an "Uncorrected" label.
- Garmin Devices
- Garmin settings can determine how pressure data is used:
- Pressurized Cabin: Enable when flying a pressurized aircraft.
- Use as Pressure Altitude: Enable when the device is inside the pressurized cabin.
- Use as Cabin Pressure Altitude: Enable when the barometric data comes
from outside ambient air. For example, when flying a pressurized aircraft and
connected to a transponder that derives pressure data from the pitot system.
- Garmin settings can determine how pressure data is used:
NOTE: The available settings are dynamic and will be based on the connected devices. Some pilots may only have the option to choose "Use as Pressure Altitude" or "Use as Cabin Pressure Altitude."
- Indicated Altitude Source
- The Pressure Altitude instrument will display the indicated altitude with a "Corrected" label if connected to a source providing indicated altitude data.
- SatCom Direct Router Users
- Viewing Pressure Altitude requires a Performance Plus or Business Performance subscription.
Last Updated:
Was this article helpful?