PfcAJ
Contributor
Showing up with a 400ft reel for exploration is a great way to get clowned on. 400ft reels are for shooting bags from deep or MAYBE scouting for new caves.400ft is more like a mini expedition Up here 400ft has remained a bit of a defacto standard (shooting deep bags if you really have to but most people use a 150ft spool, or sweeping searches for wrecks from the shot line etc) in part because the smaller 200ft version is hard to hold with dry gloves.
I like 800ft reels for exploration. I have a 1200ft reel but it's big, it's heavy, if I screw the pooch with it (easier than you realize with dry gloves) then I have no alternative. 2 or 3x 800ft reels are often a better choice.
800s or 1200s are the standard for exploration.