Navigation Study Guide

Question 1

Mayday

Answer 1

Distress call of the highest priority

Question 2

Pan-Pan

Answer 2

Urgent message concerning the safety of a ship, aircraft, vehicle or person

Question 3

Securite

Answer 3

Urgent message concerning the safety of navigation of weather warnings

Question 4

UMIB

Answer 4

Urgent marine information broadcast

Uses the “pan-pan” to notify mariners of a situation

Question 5

Rescue 21

Answer 5

The maritime “911”

Utilizes digital selective calling on ch. 70 to determine position and ID (if registered)

Question 6

VHF

Answer 6

Local, short range marine comms, line of sight. (30-300MHz)

Question 7

UHF

Answer 7

Local, short range marine comms, line of sight (300-3000MHz)

Question 8

Channels used

Answer 8

Ch. 6/156.300MHz: internship safety and SAR comms for ships and aircraft
Ch.13/156.65 MHz: bridge to bridge
Ch. 16/156.8 MHz: international distress
Ch. 21/156.05 MHz: CG working
Ch. 22A/157.1 MHz: CG public working channel and MARBS.
Ch. 23A/157.15 MHz: CG working
Ch.67/156.375: bridge to bridge 
Ch. 81A/157.075: CG working
Ch. 83A/157.175: CG working

Question 9

Coast Guard Nav Standards

Answer 9

1. ultimate responsibility for the safety of boat and crew (including safe NAV) rests with the coxswain
2. coxswians shall permanently mark their paper charts with standard track lines, courses and turn bearings along establishes routes and waypoints
3. Coxswians shall ensure paper and electronic charts are up to date
4. Coxswains must know the advantages and limits of all electronic NAV equipment available. Must be proficient with those onboard tools.
5. The coxswain must hone the selection and use of ranges and practice their use during day and night area familiarization runs required for currency maintenance.
6. Coxswains transitioning close to navigation hazards and shoals or running during restricted visibility or darkness, shall operate the vessel with extreme caution.

Question 10

Variation

Answer 10

The difference between true and magnetic

Question 11

Deviation

Answer 11

The difference between magnetic bearings and compass bearings caused by factors like the magnetic field of the boat.

Question 12

Correcting magnetic to true

Answer 12

Add easterly errors

Subtract westerly errors

Question 13

Uncorrecting true to magnetic or compass course

Answer 13

Subtract easterly error

Add westerly error

Question 14

DR

Answer 14

Dead reckoning

Estimated position from last known position

Question 14

Latitude

Answer 14

The measure of angular distance

parallels that run North or south

Question 14

Longitude

Answer 14

A measure of angular distance

East or west of the prime meridian Greenwich

Question 14

Rhumb line

Answer 14

A curved line represented as a straight line on a Mercator chart.

Question 14

Datum

Answer 14

Nautical chart water depth at low water soundings

Question 15

3 minute rule

Answer 15

Distance traveled in yards, in 3 minutes divided by 100 equals your speed.

Your speed, in 3 minutes multiplied by 100 equals your distance

Question 16

6 minutes

Answer 16

Distance traveled in NM in 6 minutes multiplied by 10 equals your speed

Your speed in NM divided by 10 equals your distance