Part of my problem could possibly be Software Status. The radio as supplied by Vans has Software Version:
Latest Versions I can find (Garmin Bulletin Oct 12 2017) are:
It would appear I'm a tad behind the times. Update I thought. Well whilst the GTR 200 series update is available on the Garmin site, for the GTR 225 series you get:
Software Information Currently Unavailable
This information is either coming soon, not applicable, or no longer available for this product.
As this is a current radio (still supplied as one option for the 12IS) does anyone know how you update the GTR 225A ???