My GT 31 has suddenly stopped finding the card. Have tried other cards with same result. From what I have read, there is no easy fix?

Is there a version of Navlink that works on Windows 10? Can't get the one I have to connect.

Open it up and respring and clean the contact terminals. Have done it with both my GT-11 and GT-31 when same thing happened. But first try cleaning the sd card contacts as sometimes dirt build up could be cause.

There are a couple of small screws in the card compartment, how do they look?
They can be an indicator of how much salty air/water has got into the SD card slot, I've found you get problems if these look rusty.
If they look pristine, it just may be some dirt in there or lack of tension as sausage suggests, if they look rusty, then it may be a bigger job to get it going again.

Thanks guys... screws look OK, so here's hoping! Any tricks/tips for opening it up?

Opened up and resprung and cleaned the contact terminals as best I could, but unfortunately did not resolve the issue.