I don't know much about the 500, but I do use mapping on my Forerunner 310XT on long runs. It's just a breadcrumb trail - no road maps and no turn-by-turn directions, just a picture of the track and a warning if you're off course - and it's more involved getting the maps in there than it is with the 705 - but it does work. I'd expect it's similar with the 500 and other Garmin devices that don't have road maps.
I got religious about mapping my long runs last year, after I missed a turn one 95-degree day and wound up 13 miles from home with 4 miles' worth of water.
Luckily I was in phone range and DH was home.
Last edited by OakLeaf; 08-07-2011 at 04:27 PM.
Speed comes from what you put behind you. - Judi Ketteler