Is to possible to use a line style that is different for one way streets so that the one way direction can be seen on the Sat Nav? e.g >>>> over the road.
yes thats possible and some maps use a second (transparent) layer for this.
Chris
Have a read of this:
http://www.cferrero.net/maps/guide_to_TYPs.html#oneway_arrows
Works a treat.
Thanks