Shot from an Old Town Vapor Angler kayak (10 feet long). I placed a boat cushion just in front of the seat, and kept the camera in a 20L dry bag for entry, exit, or if not likely to need camera for quick access, then set it on top of the dry bag when in "prime territory". I held on to my version 1 of the 100-400L and 7D for a while thinking that would be my kayak outfit, but the quality of the Mark II versions led me to sell the version 1 lens, but I've kept the 7D with a short range zoom for family and travel type stuff.
The moose weren't visible on my initial pass of this shoreline, but I saw 2 dark spots as I was headed back to camp and figured it was the cow and calf that I've seen on my trail cams in this area since June. The cow disappeared while the calf went deeper into the bush, so I drifted along until I got a good angle and waited for it to work its way back into view. As I focused on shooting the calf, I could hear splashing off my right shoulder and turned to find the cow had somehow slipped back into the water undetected and she was feeding her way toward me. The wind was drifting me closer, so I occasionally back paddled to avoid crowding her or getting between her and the calf. They both fed for at least half an hour totally ignoring me, until I decided I had enough pics and left the area. One humorous aspect was the cow would blow bubbles like a 3 year old in a bathtub, wish I shot a video clip with sound to capture that!