That is absolutely amazing JonBuoy! Tried it with a gpx from a recent tour in France and it worked perfectly. I slowed it down to 500ms a frame so I could see what was happening. Otherwise it looked a bit like the London to Brighton in 4 minutes film. Must play with it some more.
The reason for my initial query was concerned with establishing locations to use in the memory technique known as the Method of Locii a.k.a. Memory Palaces. This technique goes back to the Greeks or before, and is also used by illiterate cultures. It depends on the fact that memory of places is stored in a long-term memory part of the brain (simplified explanation!) so if you associate a place with another fact you wish to remember, it has a much better chance of being remembered. Lots of videos on YouTube about it. The technique is used by folks competing in Memory Olympiad competitions, and by lesser mortals trying to remember lists of foreign vocabulary etc etc.
Bryn