I have an Oregon 450 that has no maps installed. I bought primarily to geocache with the kids. We did that with no real need for maps.. my son and i have moved up to dirt bikes and up till real recently alway road where i knew where i was and how to get home.. But we have ventured off to unknow part and if i had not had somebody with me last weekend that knew where we were i might not have made it back. So enter the ole 450 into the discussion... What will i gain if i buy the topo maps? Will I still be able to find my way back to camp without topo maps? What else do i need to know... btw i have zumo on the the street extensively logging thousands of miles so i am not new to gps or motorcycles... just new to dirt and off road navigation .