John Helgerson wrote:
My Garmin 236 is set to have the map course of the boat at the top. I
used to have it set to have north at the top. Since changing, the
Garmin map seems to refresh every few seconds even if the waypoint is
ten miles away and the map adjusted out to show the entire ten miles.
This causes the route track to jump around too much. Is there a way
to stop it from refreshing so often?

Thanks,

John

Try with it set to north up and see if the problem relates to the track-up
function only.