Flashcards in Exam 3 Deck (40):

1

## Sailings is using math to solve for

### Courses and distance from one point to another, and point of arrival when point of departure, course, and distances are known.

2

## What are the five types of sailings?

###
1 = plane sailing

2 = parallel sailing

3 = mid latitude sailing

4 = mercator sailing

5 = Great circle sailing

3

## When used in sailings, the word departure refers to

### East to west distance in miles, or west to east distance in miles

4

## One minute of latitude equals

### 1 mile

5

## One minute of longitude

### Does not equal 1 mile anywhere except at the equator

6

## While navigating off of the equator the difference of longitude between two points, in minutes of longitude

### Does not equal the east to west distance in miles

7

## Departure is written as what?

### P

8

## What type of functions are used in sailings?

### Natural trigonometric

9

## Accuracy in navigation problems is to the nearest

### 10th of a mile or 10th of a minute of longitude or latitude

10

## A 10th of a mile =

###
608 feet

(6076.1÷10 = 607.61 feet)

11

## How many different angles does each group of trig functions contain?

### Four

12

## All five types of sailings are used to determine

### Course and distance

13

## Plane sailings is used to find

### The difference of latitude and departure

14

## Parallel sailings are used to find

### Longitude of arrival

15

## Mid latitude and Mercator sailings are used to find

### Latitude and longitude of arrival

16

## Great circle sailings are used to find

### The initial course and distance, latitude and longitude of Vertex, and points along the great circle route

17

##
Plane sailings use simple plane geometry to solve for the parts of a

And assumes that the earth is

### Right triangle; flat

18

## Why can’t plane sailings solve for difference of longitude?

### Because the earth is a sphere

19

## C=

### Course angle (off 000°/360° or 180°)

20

## D=

### Distance

21

## Parallel sailing was used prior to accurate When it wasn’t possible to determine

### Chronometer; longitude

22

## Prior to accurate chronometers, ships would run north or south to latitude of destination, then head east or west to the actual destination adjusting course as needed.

### True

23

## What is parallel sailing mainly used for today?

### As a component part of mid lat sailing

24

## DLo=

### Difference in longitude in minutes

25

## In reference to parallel sailings the course will either be

### Due West (270°) or East (090°)

26

## Mid latitude sailing is a combination of

### Plane and parallel sailings

27

## With regards to midlatitude sailings, the plane sailing is used to

### Find the difference of latitude and departure when we know course in distance, or find a course in distance when we no difference of latitude and departure

28

## With regards to mid latitude sailings, parallel sailing is used to

### Convert departure to difference of longitude or vice versa

29

##
The latitude that is used in parallel sailing part of midlatitude sailing is the

Of the latitude of departure and the latitude of arrival

### Mean

30

## Do not use mid latitude sailing if you

### Cross the equator

31

## If you are crossing the equator it’s best to use

### Mercator sailings

32

## In Mercator charts the course is measured by the angle between the

### Meridian (longitude line) and the coarse line

33

## How is distance measured on the Mercator charts?

### With dividers on the latitude scale at the left or right side of the chart

34

## One minute of latitude =

### One nautical mile

35

## Can difference of longitude be used as miles?

### No

36

## Meridional parts and D-Lo in minutes of longitude are used to

### Find the course angle

37

## The length of the arc of a meridian between equator and a given parallel on a Mercator chart expressed in units of one minute of longitude at the equator.

### Meridional parts

38

## The largest circle that can be drawn on the surface of a sphere and the shortest distance along the surface between any two points.

### Great circle sailing

39

## A great circle on the earth will be any

### Meridian and the equatorial belt

40