The rugged features of the WG-3 include an improved waterproof depth rating to 45 feet, while the WG-3 GPS offers enhanced GPS functionality for geo-tagging images that can be mapped back to your journey and a dedicated second display showing compassdirection, elevation or depth below water.
It utilizes a phone's digital compass, and read out the direction the user is facing, something that is apparently very important when navigating through public transport, while the audio component opens up Google Map features in a non-visual way.