I have never seen a GPS that has this functionality. Of course you can
set the waypoint the arc is based on as the active waypoint and the
GPS will give you a very accurate reading of how far you are from it.
You can note the change in distance from it. If the arc is in the
database, you can fly the airplane icon along the arc line on the map.
But "velocity made good", nope.

"Casey Wilson" wrote in message ...
Hello all,

Anybody know of an available function in the KLN-89B that shows
'velocity made good?' That is, if you are not flying directly toward a
waypoint, what is the closing velocity? Groundspeed, as reported, is
relative to the velocity vector, so that isn't the correct figure.
Why? you ask. Well, I had a chance to fly a DME arc with a DME. Don't
laugh, it was actually my first experience with DME. The instrument reported
the heading and closing speed. Click, the light came on! When my aircraft's
velocity vector was normal to the waypoint, the speed was zero. For me, that
dropped the workload of flying the arc way, way down. The Skyhawk SP that I
mostly fly ain't got no DME but it does have a KLN-89B. Unfortunately, the
limited user information available says nothing about the feature I'm
looking for.

Regards,

Casey Wilson
Freelance Writer and Photographer