26. Log: originally, a length of wood attached to a line and tossed overboard to measure speed, then a device with the same function; also, a record of operation (an accounting of any activity or progress)
27. Lookout: a sailor standing watch (someone keeping watch, or the position from which the person does so)
28. Manhole: an opening in to a compartment (a hole providing access underground or into a structure)
29. Mooring: securing with anchors or lines, or a place where mooring occurs (a stabilizing influence)
30. Navigation: the operation of a vessel (direction for traveling or movement through a virtual area, as on a website)
31. Overhaul: to ready equipment for use (to rebuild or repair)
32. Pilot: a steersman, or to steer a vessel (an operator of an aircraft or spacecraft, or to operate such a craft or to direct an operation or procedure, or a business or organization)
33. Quarantine: temporary sequestration of a vessel because of the possibility of spreading disease, or the location of the sequestration (enforced isolation, especially because of contagion, or the place of isolation)
34. Quarters: assigned living areas or workstations on a vessel, or an assembly of all crew members (lodging)
35. Rudder: an immersed blade of wood, metal, or plastic attached to a vessel and turned remotely to change its direction (a guiding force)
36. Salvage: to rescue or save a ship and/or its cargo, or the compensation for doing so; also, the property salvaged (saving something from being destroyed or discarded, or what is saved)
37. Scuttle: to sink a vessel by cutting a hole in the hull (to ruin something by abandonment or sabotage)
38. Scuttlebutt: a cask for holding drinking water and, by extension, the idle talk exchanged while drinking from it (gossip)
39. Seaworthy: in condition to be operated (solid or valid)
40. Ship: to send cargo or passengers by sea (to transport or distribute)
41. Shorthanded: lacking enough crew members (not having enough people to perform a task)
42. Sounding: a measurement of the depth of water (seeking an opinion or a statement of intention)
43. Stow: to put away and, by extension, to keep one’s opinion to oneself (to arrange, load, or store)
44. Swamped: submerged (overwhelmed)
45. Tack: to change a vessel’s direction, or the new direction (to shift one’s viewpoint, as in “take a new tack”)
46. Tide: the change of surface level of a body of water because of gravitational fluctuations (a fluctuating or rising phenomenon)
47. Under way: in motion (in progress)
48. Wake: the visible track of a vessel through water (aftermath)
49. Waterlogged: filled or soaked with water but afloat (full of or saturated with water)
50. Watertight: capable of preventing water from entering (solid, flawless)