Introduction to Navigation

If your ship was heading 090 degrees magnetic in a region where the variation was 20 degrees East, what would the true heading be?

110 degrees true

A ship was steaming on a course of 170 degrees True at 15 knots. A lookout on the starboard wing of the bridge reported a ship contact bearing 090 degrees R. The true bearing of the contact is __________

260 degrees

What is the shortest distance of travel between two points on the Earth (or any globe)?

A great circle

In which directions are the longitude lines between the prime meridian and 180th meridian numbered 0° to 180°?

East and West

A unit of length equal to six feet (1.8 meters); used chiefly in nautical measurements is called a _______

Fathom

The latitude and longitude for New York City, New York are as follows: 40°42'46"N lat. and 74°0'21"W long. When speaking, how would one state the location of New York City, New York?

Forty degrees, forty-two minutes north, seventy-four degrees, zero minutes west

When two objects are viewed in line with one another they are said to be _____________

In range

What are the advantages of using radar for navigation?

It can detect objects over the horizon.

What is the advantage of using "differential" GPS information?

It enhances accuracy of positional information down to plus or minus one Meter.

When recording a bearing, it should be assumed to be true unless followed by what letters?

M,R

On a compass card, what are the true bearings for each of the four cardinal points? (For example, East is 090 degrees true. Now give me the other three.)

N = 000 / E = 090 / S = 180 / W = 270

Is an echo sounding considered a valid navigational Line of Position (LOP)?

NO

_______ is the direction in which a ship is forced by wind and current. _______ is the speed of that force in knots.

Set; Drift

What is the most common use for a parallel ruler?

Transferring the bearing of a plotted course to a compass rose.

What are the standard ways of determining the direction of an object from an observer?

Visual range

Electronic navigation system using satellites are known as _________________ systems.

global positioning

Water depths, obstructions, and buoys graphically displayed on a chart are called ____________

hydrographic information

Distance on a chart is measured along the ________, using a tool called dividers.

meridian

Lines of latitude are known as

parallel

Bearing using true north as the reference is a ______ bearing.

true