I've had a Garmin DV50 for the last five years. It was something like $450 installed and has been perfect for us. Super easy to read screen, tons of options, and nice layout. In addition to depth, I have it set to show current and top speed, direction, time, and water temp at the same time as the map, with plenty of room. Garmin also includes a "safe passage" line that has been very helpful.
I've heard that Garmin has shut down their units to third party cards, but the included HD maps have been flawless, even a couple years ago when the lake was historically low. *A note: we are in the north, which many feel is the trickiest part of the lake, and we've never had an issue.
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