I had a similar problem in my 360 last December. It happened 2 or 3 times on the
trip...the GNS430W screen went yellow and the GPS navigation not available
message popped up.  This was the first long trip since the waas upgrade.  When
it happened the Tru-trak AP went offline as well.

My radio shop sent the unit back to Garmin who said there were no problems with
it.  They ended up installing a filter just behind the radio stack on the
antenna coax.  The shop said that was what they used to use on GPS radios back
before GPS radios got more sophisticated.  It has not happened since they
installed the filter.

Matt McManus
LNC2 360

Quoting Colyn Case at earthlink <colyncase@earthlink.net>:

> Has anyone else noticed any issues with their WAAS GPS installation?
>
...I get "No GPS navigation - user other nav" message.  > Colyn
>