A current moving across a lock entrance toward the river or toward the dam is known by which term?

Which type of daymark is used to mark the port side of the channel when entering...

Which would influence a magnetic compass?

A towboat has the same draft as the barges it is pushing ahead. If the distance...

What does the abbreviation L.W.R.P. on the navigation maps mean?

Which agency maintains federal aids to navigation?

How are aids to navigation marking the intracoastal waterway (ICW) identified?

An air mass that has moved down from Canada would most likely have which symbols...

When is an air mass termed "warm"?

Which is a characteristic of anticyclones?

What should you apply to a fathometer reading to determine the depth of water?