One who partakes in the activity of wardriving, which is directly related to warchalking.
Because I drove around in my car checking for bandwidth to leech, I was known as a wardriver.
wardriver: define #2
A person who finds and logs wireless networks.
By finding hotspots, Jim became a wardriver.
wardriver: define #3
One who is in movment (Car) with a laptop and wireless card, Connected to a wireless connection.
I found 16 wireless connection while wardriving yesterday!