Garmin GPS 175 Pilot's Manual page 160

Planning
PLANNING
APPS & FUNCTIONS
This section describes features that make flight planning easier and
more efficient.
Planning apps and setup functions reside in the system Utilities.
[1] Point-to-Point mode only.
[2] Flight Plan mode only.
[3] From key not selectable when Present Position (P.POS) function is active.
[4] Function not selectable when sensor data in use.
[5] Indicates pressure altitude when sensor data in use.
4-2 GPS 175/GNX 375 Pilot's Guide 190-02207-02 Rev. B