I took our sat-nav over a couple of years ago, to find the speed of my dinghy, and the distance of a couple of walks. When I switched it on, to my shock, the marina and even the pontoons were showing. We use it all the time when in the car now, it's great for driving up and around the minor curvy mountain roads, as you can see what to expect after the next blind bend. So if you have one at home with European mapping it will work in the Canaries. For some reason the cigarette lighter outlet it plugs into in the hire cars, is larger than here in the UK, so you may to wedge in with a bit of cardboard or something similar.