115 Coastal Riverine Fundamentals

Question 1

Plan of Intended Movement (PIM)

Answer 1

• Tracking is directly related to time, speed, and distance calculation. As a rule, PIM is laid out for
  every 4 hours GMT. When referring to the ship’s position in relation to PIM, you should express any
  values as time ahead or behind PIM.

Question 2

Describe the required lights on vessels and how to correctly interpret them

Answer 2

• Running lights consist of a white masthead light in the forward part of the ship (a second masthead
  light, abaft and higher than the forward one, is required on vessels 50 meters or more in length),
  sidelights (red on the portside, green on the starboard side), and a white stern light.

Question 3

Restricted visibility

Answer 3

• Anything that restricts regular visibility to a degree that endangers safe navigation

Question 4

Vessel constrained by draft

Answer 4

• A power-driven vessel which, because of her draft in relation to the available depth and width of
  navigable water is severely restricted in her ability to deviate from the course she is following.

Question 5

Vessel restricted in her ability to maneuver

Answer 5

• A vessel which from the nature of her work is restricted in her ability to maneuver as required by rule
  and is therefore unable to keep out of the way of another vessel.

Question 6

Vessel not under command

Answer 6

• A vessel which through some exceptional circumstance is unable to maneuver as required by rule
  and is therefore unable to keep out of the way of another vessel.

Question 7

Power driven vesseL

Answer 7

• Any vessel propelled by machinery.

Question 8

Short blast and prolonged blast

Answer 8

• Short: A blast of about one second’s duration.
• Prolonged: A blast of from four to six seconds’ duration.