Walkers beware

We went to the pub in Horsebridge, the Royal Inn, tonight (had a lovely meal too. Scallops. Mmmmm).   Horsebridge is only just up the Tamar from where we live, but to get there by car you have to take a rather circuitous route up onto the hills, so when we got back I thought I'd have a look and see how far it was as the crow flies, and indeed if there was a walking route along the river valley.   I used this thing to measure the route.
( It could be a wet walk ! )