Garmin, a name I trust
When it comes to GPS, Garmin is one of the more trusted names in the business. I have had one of their units in my car for years and would not leave home without. I do not know why I was surprised that they also were into making a Garmin fish finder. The one we checked out was the Garmin 90, a portable unit that works well in any sized boat, especially one where space is hard to come by. In actual use we were operating it off the side of the boat and getting a full 60 degree coverage.