Garmin GPS 100 - Manual (Page 81)

In the above illustration, the GPS 100 calculated the closest point of
approach as 025°, 5.9 nautical miles from the lighthouse. This is the point
along your route at which you will pass abeam the lighthouse. If you want this
point to be a part of your route, simply press the ENT key with the cursor over
“OK?”. This places a waypoint named “LTHS0” into your route giving you the
ability to navigate to the closest point of approach — and know exactly when
you pass abeam the lighthouse!
Suppose your are departing Love airport in Dallas, Texas (KDAL) bound for
Adams Field in Little Rock, Arkansas (KLIT). You wish to proceed direct to
Little Rock, but ATC requires an additional waypoint along your route. You
determine that your direct route will take you past the Texarkana VOR (TXK).
Use the CPA function to create a waypoint on your direct route from Dallas
to Little Rock.
In this example, the GPS 100 created a CPA waypoint on the 334° radial 27.5
nm from TXK. This waypoint allows you to comply with ATC requests while
flying a direct route from Dallas to Little Rock.
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