O.k.... follow up... basic 450 has no serious maps... basic maps...definately means basic.... we were in michigans beautiful trail infested Upper peninsula this past weekend.... gps showed our location to be in lake superior.... though it was raining quite heavily at the time... I know we were never actually in the lake.
(at least 100 yards away in fact)... road travel had us pictured on the roads and was actually very acurate for upcomming highway junctions... the go to/arrival function actually chimed about 300 yards prior to entering Newberry MI city limits. It does have basic roadways,main highways,rough graphed lakes and streams.... it was imensely helpful in finding and storeing gads of waypoints... we were researching a upcomming hunting/camping trip this fall... though I really like it so far,( the 450 t with topo maps would be more equipped to start with, but it was an extra 100 bucks, the price of the topo maps chip..) it does require maneuvering through the touch screens to save waypoints and return to the map if you are really "using" the screen to retrace your route or navigate thru unfamiliar terrain... I do not recomend this when driving at higher speeds, but on the trail it was easy enough ... I am looking into getting the dash mounting system and automotive power supply adapter to conserve on batteries and get it up into a more visible location. the topo maps will be on my wish list also.... though it was comical the idea of being in lake superior... we were actually on CoastGuard "road".... east of muskelunge lake... and I favor more accuracy... more to follow?