Beagle - quite right, it is the DME that gives slant range, nothing else. Quite a lot to think about whilst writing my last post
We didn't do GPS but I know where you are coming from with regards to amount of time spent on each instrument. I was lucky enough to be able to log 2.5 hours of VOR and DME when I went to Malta - I flew to Sicily with my cousin, who is the CFI at Luqa, Malta. We used the VOR to track there and back. I have actually had a few ground school sessions on this, including in Malta, so the theory was well covered.
With regards to trying to draw lines whilst fly - I admit, it is a nightmare to do if there is nobody to fly the aircraft for you - luckily, my instructor did, and I will ask the examiner in the test if he would be so kind as to fly it for me also, asking him to keep a good lookout of course. I agree with what's said though, the lookout is the most important.