Looking to upgrade on the fish finder that came with my Tracker 170TX. Not techno savy so looking for something easy to use. Would like GPS included and something that you can trust on what its showing under and and/or around the boat. Needs to be in the $500 range. Any advice would be appreciated. The one that came with my boat i pretty much use to know the depth I'm in and to find structure I put in (which takes forever with what i have). Would like something that when I see new structure or fish I can be sure thats what i'm seeing.