My old GT31 has frozen with just the 2 sec peak on the screen.
It was working ok when I went out. I do keep my car key in the aquapac together with GPS.
Any tips would be welcome.
It has a full battery charge if that helps. Its bloody old

Just let the battery run down to 0 then recharge, could take several dys if the battery is still reasonably good.
It's the old turn it off, turn it on again trick, I give you 60:40% chance of it working.
If you have Navilink, you could see if that will connect. It may just be the screen frozen, with the micro processor still running but I doubt it.

Thanks Mike.