I hadn't had a look at refurbed tough books for a while. So I had a look and .....mmmmmmm.
I. Must. Resist.
There is some pretty nice kit available. I didn't realise they were that cheap,
I specced up this Dell to onboard GPS, 5G and gruntier everything, for 2.3 K that's a lot of laptop.

This Mk1 tough book specced up, the same as above, is $1.8K.

Either would be a great solution for a boat. And a quarter/third of the price of a new one.