Re: 70-200 L-series 2.8
 

Most recently, I've purchased a monopod (Silk Pro Pod 600, solid, light, and affordable), and I use it in conjunction with a handheld rig. It really helps when shooting for long periods. I can tuck in in my belt to help deal with the forward weight, and I can extend it to the ground to take all the weight off my body. I should look into getting a "holster" like flag carriers use, which will ensure that it doesn't slip during use.

My tests with the 70-200 handheld were on a rig without the monopod (and sometimes with the 2x extender), and it was not comfortable for me - even when seated and using it for just a few minutes. With the monopod to assist with the weight, I might find it to be more useful.

I use the monopod in four modes:
* Tucked into the belt for the "human-tripod" thing.
* Lifted from the belt for more flexibility when tilting.
* Extended nearly to the ground for smooth walking and good weight balance above and below the hand.
* Extended to touch the ground for the best stability - especially if I can lean it against something solid.

I need to modify my backpack so I can attach the monopod to the outside. I can also use it as a walking stick, which makes it less obvious that I have photo gear.

I use a Manfrotto adapter and plate so I can mount the camera quickly. A ball head would also be useful. (I need a large to small thread adapter before I can try mine.)

Anyway, it might be helpful on your boat shoot. If nothing else, it lets you take the weight off your back between shots.