Your dad likely has a Minn Kota trolling motor, which may be able to interface with the Hunminbird. It definitely can’t interface with the Garmin. Hummingbird mega down and side imaging if pretty good stuff, too. Humminbird Lakemaster charts are, I think, better than the Navionics lake charts that Garmin uses. Garmin does have than Panoptix livescope, which is pretty neat, but personally, I would go with Humminbird.