My favorite style of simple hatch/locker latch. Perko part number 0559. It's all plastic, so no rust or corrosion, no moving parts, no springs, hingle pins or anything to wear out, etc. Just pull to open and push to close.
Then of course the "slam" latch:
This is a SeaDog part #SD28120 and it takes a little more force to close, but these are used on production boats all the time, for bait wells, electrical panel access, etc.
Jim,
Congratulations on getting her splashed. You have much to be proud of!
Best wishes for your Bluejacket offering the best of times for you and your family.
Regards,
Dave