RedactedNarrative: V1 was traveling north on the Choctawhatchee River when it hit a submerged log.  The vessel's prop came up out of the water and the motor's tiller handle struck the transom of the vessel and broke.  The broken tiller handle cut the driver of V1's left pinkie finger, slicing it almost to the bone.  The driver of V1 called FWC dispatch, to advise of the situation.  I met with Washington County EMS and found the vessel.  I towed the vessel and two occupants to the landing.  EMS transported the injured subject to Gulf Coast Medical Center in Bay County due to the laceration and metal shavings in the injured pinkie finger.