I have a kenwood in car navigation system and wanted to understand how to use it when I'm offroading in Barstow. I can't upload maps of the offroad trails so all I see is a green background when on the dirt. I also don't have a flag feature where i could drop flags every so many miles and then back track. I could just use it as a map and just head to the direction i want but it doesn't help me decide which road to take if the road splits. I can get Longitude and Latitude readings but I have no idea how that works (even though i'm an engineer). So how do you guys use you're nav?