I have a Lowrance 3500 C GPS which has a 5" color display. I have mapped Many trails in Minnesota, UP, Lower Michigan and some in Indiana. I can add stop signs, warning signs, bridge, fuel, restaurants ect, icons on the display. Last night I brought the unit into the house hooked up to 12 connection and input all of the trail numbers on the trails. I saved the trails onto a SD card also for transfer to another display. Not sure if Garman and Lowrance communicat with each other but I am willing to share information. I too installed the unit on the handlebars. I will not have another machine without a gps. I see these as being an option in the future, with trail map cards being sold and advertised on.