The new bolt has maps on it, and will use them to re-route to the course if desired. I turned that feature off since I didn't want to play with it on my first few rides. The old bolt had basic maps on it but the colour version has OSM maps with all the street names so it'll do full routing right on the unit, complete with turn-by-turn with street names. It'll also route to saved locations like home if you save the locations ahead of time. Just having the off-course alerts that almost all gps feature nowadays is all I need. Even with the routing feature on the bolt I'm still more likely to pull out my phone and use it to look at the maps, it's much bigger and easier to use. There's apparently 16gb on the new one, I'm not sure if I ever ran into storage issues on the first bolt I had, but I deleted most of the maps that came pre-loaded on that one, as well as my new one.
I've started saving my rides whenever I stop for a sleep, usually works out to one calendar day for each ride.