Very cool! I enjoyed reading the adventure you and your family went on and hope that I can do the same trip someday.
What GPS software are you using? How are you downloading it?
Thanks!
Short answer:
I use Garmin Basecamp - free version of their mapping software. Can be downloaded at gpsfiledepot.com along with a great tutorial on how to use it.
Long answer (that probably belongs in another section of the forum?:
For mapping there are two options.
Option 1: Start in googlemaps and plan the route using bicycling directions rather than driving directions. Once the route is close to what I like I will change the view to satellite to see if what the terrain and road surface looks like. I"m going for as rough as possible usually. Once you have the route I download it from googlemaps to my computer. It is a kml file which is unique to Google ( I think) so Garmin devices won't recognize. You can use the file in Google Earth but I rarely used GE except to do "fly-overs of the route and to estimate distance between gas. With the kml file on my computer I to to gpsies.com. Find the tab on the site homepage that says convert. Convert kml to GPX (I cannont remember if I ended up using gpx track or route. One worked one didn't. It will take some experimenting). gpsies.com will save the file next to your kml file on your hard drive. Once that .gpx file is on your hard drive you can open it up using file options on Basecamp which you will have on your computer.
Option 2: Use track creator tab on gpsies.com to create your route and then save as whatever file type you need. No need to convert.
Most likely, once you have the route opened in Basecamp it will be made up of thousands of via points. Most gps devices have a max number of via points on a route set at 250. So you have to reduce the number of via points. This essentially means that instead of having thousands of little dots at every turn or bend in the road, you will reduce it to only major/ important turns in the route with straight lines in between points. It makes it more confusing on the ground. To reduce these points: open track in BaseCamp, the track will show on the left side of the BC menu however you named it, right click on the route name, go down to properties, a new box will open, click create route, enter 250 (whatever your device max points is) as the max via points.
Done.
The route will show up on the menu bar on the left. Connect your Garmin device, right click on route and save to gps or microsd card for later use in gps.
To download free maps for use in BaseCamp. Go to gpsfiledepot.com and search for maps. I usually use the free ones and donate something to the site. Download to computer, import into BaseCamp using import option under file menu. To save the map to your device or to you microsd card. Connect your gps, right click on device name on left menu in BC. Click option to install maps, go through the process to save it on your device.
There are some tricks with using maps. I saved all my maps on one large microSD card that the device uses. I saved them titled Arktopo, Oktopo, etc. However, when you save the map to the gps/card it will be called "gmapsupp." If you don't want to use that map immediately or want to save multiple maps, you need to rename the file something else. Late rwhen you want to use/switch maps, I put the microSD card in the computer (or connect the device as a storage deivce) and rename the file names. The one you were using you rename to Colorado topo and you change the Utah topo to gmapsupp. Now you have the Co map saved and the Utah map displayed on the GPS.