David,
I think I have very similar cracks at my stanchion posts as well. So far I have ignored them....but perhaps that is false economy.
I googled “spider cracks in gel coat”.
There is a lot of useful information including this which looks like a easy fix if the have not progressed or deteriorated too far. I doubt the ones in your picture are letting much water in yet. I suspect waxing would be effective in the short term. Another site showed ones that had progressed much further and needed to be ground out with a Dremel. (I doubt you need do that at this point).
https://magicezy.com/repairing-hairline ... r-gelcoat/No affiliation and not sure if you could buy it online or not.
Good luck. Let us know how you end up resolving them.
- Chris