Garmin GPS 100 - Manual (Page 80)

12-5
When the recommended altitude is within 1000 feet of the final altitude, the
GPS 100 will inform you with the message “ FINAL ALTITUDE ALERT”.
12.5 CLOSEST POINT OF APPROACH
The closest point of approach feature, introduced in Section 7.6, allows you
to create a waypoint on the path of a route that is directly abeam a reference
waypoint of interest such as a navigation aid. This feature will help you locate
your position relative to known points nearby your route.
Suppose you are navigating around the coastline of a point with a lighthouse
as illustrated above. You need to know when you pass abeam the lighthouse
so that you can turn inland but, due to poor visibility, you cannot see the
lighthouse. The CPA function will help you find your way!
First, create a waypoint with the position of the lighthouse (this information
should be available on your map or chart). Go to the CPA page, enter the
route number (0 if it is your active route) and the name of the waypoint
representing the lighthouse.
BOUY7
LTHSO
OUTLT
25°
5.9 NM
LTHSE