Bravo,

Done both and still none the wiser


Hmm. I've seem this happen with one single customer (we're a German
pilot shop) and have never been able to reproduce it. Have you tried
calling Lowrance support?

One last idea: There's a setting somewhere that says how close you need
to be to a waypoint for the arrival alarm to go off. That should be at
a half or quarter mile.

--
Thomas Borchert (EDDH)