When the boat is equipped with a motor, the motor must be tilted up, or the boat anchored. When I had the hide on my boat for duck hunting these are the rules we played by with no issues from inspecting CO's. Same rules would apply for big game, but as some one has pointed the moose can not be swimming. Therefore it either must be in the boat with you or standing on shore at the time you shoot it. If you are in a self propelled water craft aka: canoe you can paddle and shoot at the same time. I am speaking of Ontario.
As far as distance from shore, at one time it used to be for waterfowl you had to be within 200 yds of a natural weed bed. That changed quite some time ago. We used to hunt with my blind boat half mile or better from shore and the CO's never took issue. (Georgian Bay) But you may be wise to check the finer points on that one in case it has changed again, and some rules may be water body specific.
Motor does not need to be lifted and boat does not need to be anchored.
You cannot shoot big game from a motor boat. Period!
As far as being with 200 metres of a weedbed....not in the last 30 years.


















































