Yankee Troller

It is compatible. The adapter is needed.

Great idea. Make sure the GT56 is the lowest transducer on the transom so when using the side imaging the other transducers don't get in the way. Other than having to go into the settings for transducer installation and choose what transducer you're running it will work.

For open water trolling the P66 offers a wider cone angle and dual frequencies. The wider cone angle allows you to see more under your boat. The GT56 has a high wide CHIRP frequency. This gets you a 16-24 degree cone angle. The P66 on 50khz can get you 40-45 degrees. It's almost double the size to allow you to see more. These fish finders with pre-packaged transducers are good all around transducers. but they are geared towards inland fisherman who bass, panfish, and walleye fish shallow water looking for structure and bottom detail. For trolling guys are in a large lake in open water looking for pelagic fish, so the bigger cones allow you to see more.

Depends on the boat. If you want a transom mount transducer then an Airmar P66. If you want a thru-hull (recommended) an Airmar B60.

Neither transducer is great for trolling, becasue of the small cone angles.

I've had 3' leaders work and 8' leaders work behind Kingfishers. It comes down to confidence and trolling speeds.

You can run it either way.

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You have two options. You can get a single battery that's 24v, or go with two 12v batteries in series.

I sell Pro Guide at Krenzer Marine. What purpose are you looking to use them for, and for what voltage (12,24,36)?

Be careful putting the weight of 3 lead acid batteries and a trolling motor in the bow of that rig. It will affect the bow lift/ride. This hull design was constructed 20+ years ago, and these trolling motor options weren't "a thing." If you want to go 36v to take advantage of the run time and thrust I'd suggest going with 1 36v Lithium, or 2 in parallel, to run a 36v trolling motor. I also have 24v lithium options as well to keep weight down. Lithium batteries aren't cheap, but they have a longer life expectancy, and offer better power throughout the a charge.

I'd reach out to Cold Steel or Dirty Goose Sportfishing

FishUSA has them - Silver Streak

I have been using shotcut with the help of YouTube tutorials. I find I just don't use it enough to remember how to do the simple stuff. I really liked Windows Movie Maker, but it was pretty basic.