The maps you mention only work on Garmin devices. In fact, Garmins are just about the only ones for which there are free maps available, because the manufacturers guard their map formats as trade secrets, so they can sell you map updates.
Then, on most bikes it will need to be waterproof and shock proof. That counts out most models.
Trust me, you don't want to share ALL tracks and waypoints, any more than you want to share all pictures in your camera.
Just like you will copy your pics to a computer, select and edit them, so you will want to select and edit tracks and waypoints. You then upload them to the appropriate places for some kind soul to collate them into something useful, eg. Ulrich with his GPS accommodation directory and OSM to turn your tracks into roads on the map which you can then load into your GPS to navigate with.
Yes, sharing is great, if only more people made just a small effort. It's not that hard.
The idea of an "open source" navigator has been bandied around. Not sure how this might work... OS navigation software is in the works, the hardware is the hard part, at least for us bikers. In a car or as a handheld a phone with GPS running an appropriate O/S will work.
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