No worries mate - wandering off-topic is half the fun. Anyway, it's not something I'd have thought of, so useful info. Right now it's chart and stopwatch for me, at least until I get through the skills test. Then I might buy myself a present too
Completely off-topic now, but Chuck - Amazon.fr have finally got around to delivering my copy of
Un vol de légende sur les traces de l'aéropostale (on the third attempt, after delivering a road map of Limoges and then a porn film

- I think the latter was 'repayment' for a strongly-worded complaint about the roadmap. Somehow I don't think they like English customers

). Many thanks for the recommendation