@Jasonbourne experience in the cycling club I'm in suggests Garmin 800 battery life when navigating in much reduced? I only replaced the 510 as it kept crashing when following a route, it was otherwise a good device. I've not tired the 8xx series, a lot in the club have them and swear by them. The bigger elemnt battery life is 17 hours.
@Andywinds You can upload Strava routes, but this doesn't offer turn by turn navigation, but that can be done on ridewithgps. So it depends what the club issues it's routes on, if its Garmin connect, it is possible to export a GPX file and upload that to ridewithgps then send to the elemnt. If its Strava you just duplicate the route do that it's in your profile then sync the elemnt. Most of my rides are done in the country lanes / villages / small towns and the maps work fine, I've not used it in a city so I don't know if the maps gets crowded with all the roads, but you can zoom in / out as needed.
You get the maps with the route marked on it.