It Worked!!!!! I haven't looked at the map trace yet (although that usually works so I wouldn't expect a problem) but this bit with distances and times worked just fine.
So thank you Kim, Cudzo, JB, Phil, Feanor and Ian (and anyone else I might have missed out), that might look to be nothing to you experts but it's a quantum leap forward for me!!
now another little question: is there much point in selecting GPS +Glasnos satellites if there is a good fix (today I had 4 full strength GPS satellites + 2 others and what I presume is the accuracy at 7m so I didn't bother with the russians)? Does the unit use more power handling the extra satellites?