I have an old Garmin Map76 that I can download to. It won't take a data card but you can download directly to it (with the correct hardware). I put topo maps on mine and just use it snowmobiling now. I wouldn't recomment it for a boat as it is black and white. However you may be able to pick up a Map76C (same unit only color) used for very little cash. Just make sure you get a pc cable for it. Normally the older ones are NOT usb, just serial compatible but usb/serial adapters are available. Hope this helps.
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