GPS receivers are now made waterproof, lightweight and small enough to fit on a bike easily. There are 2 basic choices to take on your bike: a GPS unit designed primarily for navigation with a dedicated bike mount, particularly suitable for cycle touring and finding your way in unfamiliar territory, like the Garmin eTrex Vista Cx; or a dedicated bike computer that uses GPS to track your training routes and provide detailed analysis of your workout like the Edge 305, with more limited navigation capabilities. Most units come with only very basic maps installed and you may need to purchase more detailed maps for your area to be loaded onto the unit for navigation.
All electrical goods sold on wiggle that come with a mains power supply are supplied with a UK plug. Please check the product description to see if any other plugs are known to be included in the box, otherwise you may need an adapter for use in your country. Most power adapters will accept 110-240 Volts.