"Muddymike" wrote in message
om...

The Tom Tom software on my iPhone has this facility but its only possible
whilst on the stretch of road with an out of date limit, or at least I
haven't worked out how to do so later. Unless you have someone else
driving it can't be done!

On my tomtom you can do it any time.
You can also press a button to mark a position to change as you drive.
AFAIK its the same on yours.