Hi Charlie, thanks for the reply.
I've probably been a bit hasty as I only had a quick try out last night and I wasn't able to get the PDA dash mount to stay in place so it was a bit fraught to start with.
Also I was using the Holux unit on the dashboard which means it was working through a "metalised" windscreen so it is surprising it was working at all. I didn't think to check how many satellites it found but I can get six good bars up sitting in my office.
Tonight I'll put it on the rear parcel shelf where the old receiver lived. This will give a fairer comparison. It will be good if it does work through the front screen as this is much easier to access. I'll let you know.
One thing you may be able to help me with, do I have to "connect" to the PDA each time I switch on or is there a way to "pair" the unit to the Ipaq 3715 automatically as with a mobile phone. Its a bit of a nuisance, particularly having to explain it all to my wife who would like to use it too.
Thanks again
TonyZ