As the son of a Newfoundland fisherman, and as someone who has jogged squid and cod, let me offer the following advice.
Clothing: you will get squid juice on it... Wear stuff you don't mind getting dirty... And your hands will not be used to the lines so get a good pair of gloves.... The ones that are cotton on the inside and look like they were dipped into a vat of liquid rubber.. And DO NOT WEAR SHOES!
It can get slippery, make sure you have a safety line on the camera. Also, if you have eyeglasses, use a string to tie them on your head.
You will need a flash.... Squid jigging is done at night.
They won't take you out in rough weather so you don't have to worry about falling overboard. If it does get rough and you are on deck, they will insist you are on a line.
If you get juice or salt spray on the camera, you should be able to rinse it off with fresh water.
Don, I owe you a beer! Terrific advice, thanks.
What are the squid like if you do get in the water? Are they aggressive and do they attract larger more dangerous fish - like sharks? Had been thinking about getting a housing for one of my cheaper cameras and using that to get some shots from in the water.