Veterans Day is also when we...on average...freeze up here in the north. Any day after Nov.10 we can hunt a lake or pond is a bonus. Most big water, and all small water will be froze most years. We'll still have ducks to kill on the bigger rivers...but most bail out.
Amp hours is amp hours for your batteries. Run time is fairly easy and fairly predictable assuming you know the output of the batteries, and the draw of the trolling motor.
The big difference though is a new trolling motor will be more efficient than that old Motorguide.
I've had several encounters with birders, both here in MN and elsewhere. Never once was one a negative ordeal. I doubt that will change any time soon.
What I can see though is...our anti-hunting DNR, on their own accord, making hunting areas less hunter friendly, and more general public...