I have an older Garmin 172C with Bizers card and it works great. It shouldn't be hard to find something like it used for real cheap $$$. Install is super easy (unless you connect it to your radio and or depthfinder) just 2 wires. The antenna is built in and the colors are readable in all sunlight conditions. I would talk to some boat owners at marinas, etc and get their input. Just remember, the bigger the screen the better you'll like it.
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