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I'm a long distance cycle tourer. I spend a week or more at a time biking from point A to point B carrying all my gear on the bike. I am legally blind and have a very hard time reading street signs. I am looking for a way to upload specific routes into a GPS with voice prompts. I can't just let the GPS pick the route, because it picks routes best for cars. Is there a way to build a route in say Google maps and upload that to the GPS. Or if I have a list of waypoints can I string them together to make a route in the GPS. The GPS has to be a voice nav GPS, because while I can see well enough to set up the GPS there is no way I can see it while on the bike, unless I stop and use a magnifying glass which isn't really practical. If this can be done what GPS Supports this function.

Thanks for any help.

For road navigation units for exterior use (that are waterproof) and speak directions you could look at the Garmin Zumo series (link) or the Nuvi 500 series (link). I believe one of these models allow navigation with 'via points' (additional waypoints) but I'm not positive.

A little reading of the Zumo 660 specs (link)
"Plan and Share Your Rides

Found the perfect backroad to share with your riding buddies? Or perhaps you’re planning a cross-country trip and looking to avoid as much interstate as possible. With the zūmo 660’s powerful trip planning tools, you can create your custom routes via computer and then transfer your saved route directly to your zūmo.'