I agree with GR. Take the time to learn it. I build my routes day by day, that way I can see the total day distance & how many miles are left. For the majority of rides within AZ I built a file called Waypoints. That file contains all the cool places, gas, food etc in AZ that I might use. If we take off for the day, change our mind I can always pick a Waypoint to go to. I also use that file as the basis for all the within AZ routes I create. I always use Waypoints because they show up on the GPS navigation & tell me how far to the next point, great for planning gas when there are not a lot of stations.
This is what my routes look like for a trip, this was our Memorial Day Trip. The XXa or b are additional routes for things we might decide to see. These are all in the GPS when we leave, that way the entire trip is there but just not in a signe file.
D1 Home to Winslow 161 mi 2:58:42
D2 Winslow to Chinle 174 mi 3:14:25
D2a Chelly Overlooks N 37.5 mi 1:00:10
D2b Chelly Overlooks S 34.0 mi 0:58:52
D3 Chinle to Cortez 139 mi 2:17:55
D3a Mesa Verde NP 50.3 mi 1:15:03
D3b Balcony House 8.5 mi 0:15:53
D4 Cortez to Grand Junction 214 mi 4:44:42
D4a CO N Mon 43.2 mi 1:12:16
D5 Grand Junction to Moab 107 mi 2:04:14
D5a Arches NP 45.4 mi 1:18:40
D5b Dead Horse Point SP 44.8 mi 1:01:18
D6 Moab to Gouldings 187 mi 3:58:21
D7 Gouldings - Home 340 mi 6:11:40
PM me an email address & I will send you the Waypoint file & a trip file so you can see how I do this.
Hope this helps