Any idea what the "lock point" on the USB port under the seat actually signifies/means/enables? Also is there any sort of USB plug that can fit in the socket and prevent the ingress of water as I am pretty sure with a normal cable in whilst riding in the wet, water would end up filling up the socket due to its orientation? TIA
May be its a screw fit and that’s just telling you which way to take it off. Try it, see what happens.
Sugru. Mould it around the usb cable and plug it in. Push the sugru into the hole to form the shape and then carefully pull it out and let it set. Boom, instant waterproof seal.