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The following diagram displays how the CPA function works. The route is from
KDAL to KLIT, and the user desires to create a waypoint on the route in reference to
TXK. The GPS 150 calculates the closest point the route comes to TXK, which the
unit calls TXK0. The unit will display TXK0’s range and bearing from TXK.
Closest Point of Approach (CPA)
The GPS 150 will attempt to match the NAVAIDs identifier to create a new
identifier for the CPA waypoint. The GPS 150 will always add a numeral as the last
character in the new identifier.
46
REFERENCE
CPA Diagram
Section
3
NORTH
TXK
KDAL
KLIT
TXKO
327°
26.7 nm
CPA page
150man rev E 7/24/98 3:10 PM Page 46