For all I know, there might very well be some well-known trash metal bands here. Should I look and send you some samples if I find something?

£99 for a compass is still more than I would want to pay for 1600 years old technology. Call me cheap, but yet..
Hmm, looking at the old Silva, the gradients seem to be just printed on some kind of paper.. Time to go looking on the internet and check if someone has done any surgery on these. If I could replace the gradients/print with something larger, it would do very well..
Followup:
Found this:
http://home.swipnet.se/ansar/c24.html Now, I have to decide if I want to risk screwing up the old, but still expensive, compass.