I would go with two decent wirelesses, each being recorded to its own channel.
(But bring the 415 and a mic stand along in case anything with the radio
mics goes bad as is often the reality.)

If this is for a real TV show, maybe you could find a way to get a sound man
to go along with a small portable record rig.

I've done quite a few "small fishing boat" shoots. You'll be doing a lot of audio
work to get rid of clunks and clanks. That's why I would NOT recommend
putting the 415 in the boat with the guides. The voice will be tiny compared
to the noise they'll make while fishing, that why the wirelesses are highly
recommended.

Thanks for all the advice guys! Big help. The boat is carpeted and fiberglass so there shouldn't be any clanking like on aluminum boats. The main sound other than the guides that I would like to get is the pop of a topwater popper and the burble of a buzzbait as it moves through the water. We'll see how the wireless mics do at picking up those sounds...

Thanks alot and if I need other things answered I'll post them back here. If others have ideas or things to add by all means post them!

-Jonathan