Question 1860Navigation General

The correct answer is C) tree or log awash in a nearly vertical position. A deadhead is a submerged or partially submerged tree, log, or other object that poses a hazard to navigation. These objects are typically found in a nearly vertical position in the water, making them difficult to see and potentially dangerous for vessels. The term "deadhead" refers to the fact that these objects are essentially "dead" and cannot be easily detected, creating a potential hazard for mariners. The other options are incorrect because they do not accurately describe the definition of a deadhead. Option A refers to a crew member who refuses to work, option B describes the upstream end of a land wall, and option D refers to a buoy that is adrift, none of which are correct definitions of a deadhead.