Q&A special: Satellite-Navigation - How much?

Q: How much will I need to spend to get a system that can route me around traffic jams?
D Frederiks, Swansea

A: As a rough estimate, expect to spend at least £250. The ability to dodge jams is useful, but remember these systems aren't foolproof.

We've used systems that have directed us off a major route to avoid a hold-up, only to lead us to another jam on a minor road.