Курс судна

Starboard - The right side of the boat.

Port - The left side of the boat.

Starboard tack

When sailing with the wind coming from the starboard side of the vessel.

Port t tack  a sailboat's heading when the wind is coming from the left, or port, side.

Іn irons

Stopped head-to-wind, a sailboat is said to be "in irons".

No-go zone