Thanks to Mike & Nick, very prompt service, answered questions promptly & very clear email instructions to install. Had query re: installing with Windows 7 & had it running within hours. Showed genuine interest in fixing query with no palming off of problem. Followed up by asking if they could be of any further help. Service like that is very rare. Unit is easy to use & very accurate. I'll be recommending unit & company to anyone looking at GPS unit. well done boys, much appreciated.....Ian