thanks for the input so far.

mike

andy - that sounds like just the job. but we would first have to drive round once to store it, and then add all the POI. but that's one way of doing it that we hadn't thought about. we wanted to get something sorted before going next time.

phil - it's more for telling you what's coming rather than comparing lines and times, so the accuracy doesn't need to be that good. 2m is good enough.