I am waay new to this. I don't know what you mean by "map time" or where I would marquee a section. When loading it, i marqueed the whole map and just dumped it all onto my 4gb card. It shows up if I select it in the Nuvi 500, but I haven't found it useful. Currently it's not even active, as it clutters the screen when zooming in; plus I figure it will probably slow searches down.
I mostly loaded this map because the supplied Garmin Topo map is missing lots of trails that I know exist. Unfortunately, when I checked those trails on the California Topo, they also weren't there. In once case it was more than a trail--it's the main paved road leading into a state park past the ranger's kiosk and to the primary campground. The campground is shown on both maps, but no indication that a road leads to it. None of the trails in the state park are shown.
Well, it was worth a try. Thanks again for your help.
banjr