Does any GPS allow custom routing options??

If you add way points, from the route you want to take. It should route you more properly. If I am understanding you right. You can add up miles using your atlas pretty easily with the city to city

 

I never used a gps, just used Google maps. It would allow me to drag the route where I wanted and then I would write down the directions. Kept my notepad on my dash and just followed the road signs.

Came in handy when I needed to mark a custom route for OS/OD loads

 

I think it would be awesome if there was one that did that... But I think until the GPS picks up the route you want, you will have to manually add/subtract.

 

Other than updating maps they really haven't improved much... I just upgraded to the rm 530 it has a quick route planner on it. ( I haven't messed with it, my deliveries are all within 50 miles of each other) but I still do way points to get going the right direction.

 

Oh it does give me a multiple route choice... That is actually helpful.

 

In the garmin you have to use the trip planner feature for that.

Enter your waypoints from your map planning.

That way you can avoid that pesky recalculating due to a one minute backup into car mode.

You can hammer detour. That sometimes works on a garmin.

I use Google for multiple routes for cars and see if I can legally shave off a few miles.

If all else fails you can use the online promiles calculator uship car/truck route & truck stop guide point to point routing.

....or just use a paper map & notecard until you get to the city.