What's the difference between boatage and pilotage?

Boatage

Definition:

• (n.) Conveyance by boat; also, a charge for such conveyance.

Example Sentences:

Pilotage

Definition:

• (n.) The pilot's skill or knowledge, as of coasts, rocks, bars, and channels.
• (n.) The compensation made or allowed to a pilot.
• (n.) Guidance, as by a pilot.

Example Sentences:

• (1) There was a statistically significant rise in catecholamines during three pilotage operations for each of five volunteer pilots (p less than 0.01).