Thanks everyone.

@Bri: I bought the unit through the Amazon link from the Openstreetmap site. I'm pleased to report the software version of the unit is already 3.20 and the GPS software is version 2.90. I got the 2Gb micro SD card and you're right... it can store a lot of tracks!

I'm getting into it now and have a good set of tracks and accompanying photos beginning to accumulate. I really like Josm for editing.

David.