Only trouble is the PT5101 is £15 in the UK - little bit more than < £1 for a 7805. I bought a bag of 2A ones (in the oval cases) from a car boot sale for a couple of quid a few years back, so I'm going to use them otherwise fitting two cars with antennas and power circuits will cost more than the encore GPS units!

In fact, I have just paid $50 for two active antennas off ebay (inc shipping) - they qre quite nice and come with 16ft cables so I am pretty pleased. A fair amount of searching found £30 each was the cheapest I could find in the UK. I could have done better but at $50 I gave up wasting my time!

Gareth