yes, I installed a marine socket.
I then took it a bit further and made my own cell phone, GPS, and mp3 player charger (since they all take different plugs) with an LM7805 chip, and then modified another USB plug with an additional chip and heatsink to give me 3X the current for any other USB accessories (such as to quickly charge up camera batteries)
Did the same thing on my V-strom.