Garmin GPS 400 Pilot's Manual And Reference page 103

To create a new user waypoint by referencing an existing waypoint:
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The GPS 400 allows you to create a new user waypoint at a defined radial
and distance from your present position. To reference your present posi-
tion, follow the steps above, but press
in the reference waypoint (REF WPT) field to indicate that radial and dis-
tance information will reference your present position.
The second reference waypoint field (REF WPT) is a temporary reference
only—not a reference that will be stored with the user waypoint. By
default, this field will display a radial from the nearest VOR. However, you
can select any waypoint—by identifier—to use as a reference in this field.
Your GPS 400 can store user-defined waypoints which are generated
from other equipment in your panel. For example, an EFIS equipped
with joystick inputs can be used to create user waypoints which will (if
your installation supports this) automatically transfer to your GPS 400.
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in step #4. "P.POS" will appear
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WPT PAGES
Creating
User Waypoints
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