I use this script for quite a while and make great experience with it. The coordinates have been precise enough in every situation.

Just try it!

But a more precise way is also welcome.

Greenflag is up and running, my only compaint is that I cant't get closer to my routes then +/- 5 meter.........
This script is working and doing a great job, thanks for your effort.

Keep in mind that the only coordinate information that Greenflag gives is at the turns. If the road curves, GPSapp will draw the route from one turn to annother. If there is an additional source of information for you guys that gives you route coordinates (points between routs) I would suggest you use that.