Being in France, presumably you collected the snail for lunch 
We don't normally collect snails with that sort of colour; ours are sort of browny grey, and you need a good few of them to get a plateful (normally sold prepared by the dozen but I prefer them prepared by my MiL who is périgourdine and so an expert on many culinary delicacies). They need to be a decent size. Perhaps they do things differently in Alsace!
I went out today to start testing the route options for our club 100k next year. The Garmin was playing up somewhat. After delaying the departure for a good half hour by insisting that I was in the middle of the Aegean (the wet bit) and going stroppy when asked to budge it also gave a highly optimistic distance and speed figure, to the extent that I don't know how far I actually went, and still refused to land on my real position when asked (had to arse about zooming out and in and playing silly buggers with the joystick). Very tedious! It gave me over 60 kms with an average over 30k which was way out, avg half that would be closer to correct! I will have to plot the course to know!
Still the map trace is correct and the distance is irrelevant since the route was a bit musclé and I really don't think I could send the club that way and live to tell the tale! Out for three hours with a certain quantity of non-mobile faffing. Perhaps the Garmin doesn't like being stuffed in a side pocket of the rackbag; it has been notably incorrect on the last three rides, all with the folder. I will have to pinch the bar mount off the Vitus since that one won't be going out before the spring.
edit: Did the plot today on Openrunner: distance real 33.8kms; distance Garmin 92.36kms. C'est beau, le technologie! It's a good thing lives don't depend on that sort of accuracy!
