We have found the best way to create a trail on the computer is to use Google Earth.• Download and install Google Earth• Right Click on My Places and create a new folder• Click on the "New Path" Icon on the menu bar.• Start at the beginning of your trail and keep clicking to create points along the path. The more clicks, the higher the resolution. The fewer clicks, the straighter the line in between each point.• Change the name of your path and click ok.Find the new path you created in My Places (hopefully in that new folder you created)• Right click on the entire folder if multiple paths or just the one path if that's all you want to export and left click on Save Place As.• Name your file, select a location to save and change file type to .Kml• Go to http://www.gpsvisualizer.com/gpsbabel/• Type of GPS Data you want to convert: Tracks• Input file Format: Google Earth (Keyhole) Markup Langauge• Output file format: Lowrance USR if using an older GPS, GPX XML if using a newer touch screen GPS• Upload your file and click on convert the file. • Click on your file to download.• Save to a chip and load/import into your GPS!• Cool tip: Check out the section under Create Graphics with GPS Visualizer. If you click on one of those links it will show your trail in Google Maps, Earth or as a .jpg image.