Originally Posted by
QueueCT
Handlebar mountable (either out of the box or with a 3rd party mount)
Reasonably water resistant so I don't need to baby it.
Under $300 (or so)
Rechargeable batteries with a 15 hr+ run time (if possible)
What I don't need (though it's okay if it's there):
Track generation and storage
Speed, cadence, heart rate, etc.
Automatic navigation
If you want to download a route and have the unit provide turn by turn instructions prompted with an audible beep, a Garmin 705 or 800 will do that. The 705 has been discontinued so you might find them deeply discounted or available used from people upgrading to the 800. I have a 705 and use it primarily as you describe for navigating downloaded routes, though I also use time, speed, cadence, etc. When rides are completed, you can upload the actual track and data to any number of websites including RWGPS, MMM, GPSies, Garmin Connect, etc.
A general note. Garming Edge products are somewhat buggy and problematic IMO. Go to the official Garmin user forums to get an idea or post questions to other users.
https://forums.garmin.com/forumdisplay.php?f=20