@Paul-Johnson-5
This could be pointing out the bleeding obvious, but here we go...
First step: get Gold membership (hey ho, but the devs need to make a living) to gain access to vital features below.
Second step (others will come up with better ones I'm sure):
- use the Toolkit -> 'Compare route with' option
You can see how each of the main routing engines think your waypoints sit on each map. It can be surprising!
You need to go to the maximum zoom to check, especially in urban areas, where one engine might route a different way to the other. Which is right? Who knows, but make a sensible guess and force the others to follow that route with some extra waypoints.
Also don't forget that having the 'Traffic' option enabled on HERE maps may give you 'odd' results if you're planning for a trip in x months time (it may route you around a closed road which will be open next week), so consider turning that off during long-term planning.
Adjust the waypoints accordingly so that all routing methods show the same route.
Then distribute, and not before!
Last rule:
- The leader is the boss - so follow him. Yup, even up that dead end that he misunderstood. It doesn't matter if the follower's satnavs say otherwise.
[EDIT: just re-reading your post: if you mean the route is perfect in all possible routing engines, but the riders/drivers aren't perfect, then you need to add fixed meeting points on the route, i.e. 'via' points that must be passed through every 15-30 mins. At worst you'll only lose them for 30 mins. It that fails it's back to texting and finding out what went wrong, and agreeing a waypoint number to meet up again.]