Nav 2

Front 1

Dead Reckoning

Back 1

the process of estimating your ships future position without taking current and wind into effect

Front 2

What does Dead Reckoning help determine (6)

Back 2

-when to adjust speed

Front 3

The 6 rules of Dead Reckoning

Back 3

1- at least every hour while in open ocean

Front 4

what to use for time-distance-speed calculations (4)

Back 4

slide ruler

Front 5

3 minute rule

Back 5

D=Speed * 100

Front 6

6 minute rule

Back 6

Distance= Speed/10

Front 7

When do you plot a running fix

Back 7

when only one nav aid is available

Front 8

the intended direction of travel with respect to the Earth

Back 8

Track

Front 9

the intended speed to be made good when planning a voyage

Back 9

Speed of Advance

Front 10

the direction from which the current is flowing

Back 10

set

Front 11

the speed of the current (knots)

Back 11

drift

Front 12

the direction of the net movement from one point to another

Back 12

Course made good

Front 13

the net speed based on the distance and time of passage from one point to another

Back 13

Speed made good

Front 14

Current Triangle

Back 14

takes into account set and drift

Front 15

To calculate SMG

Back 15

Speed= Distance/Time

Front 16

To calculate CMG

Back 16

-slide ruler between 1st and 2nd fix and see when direction on compass rose

Front 17

to calculate set

Back 17

DR to 2nd fix

Front 18

to calculate drift

Back 18

distance between DR and 2nd fix

Front 19

Purpose of estimated position

Back 19

to estimate a fix when there are no nav aids available

Front 20

the distance gained in the ORIGINAL direction the ship was traveling from the point that the rudder was put over to the point when the ship is steady on the new course

Back 20

Advance

Front 21

the distance gained PERPINDICULAR TO THE ORIGINAL course from the point where the rudder was put over to the point where the ship is steady on the new course

Back 21

Transfer

Front 22

Advance and Transfer Table

Back 22

different for every ship

Front 23

transfer during a 180 degree turn

Back 23

Tactical Diameter

Front 24

the diameter of the approximate circular path that a ship describes if the rudder is kept over indefinatly

Back 24

Final Diameter

Front 25

parallel to new course

Back 25

Slide Bar

Front 26

Purpose of the Slide bar

Back 26

assists in quickley revising a turn bearing if the vessel is off track just prior to turn

Front 27

Steps to plotting Advance and transfer

Back 27

1- transfer

Front 28

dotted line

Back 28

Turn Bearing

Front 29

final leg that the ship must follow to arrive at the center of an anchorage

Back 29

approach track

Front 30

the bearing to a prominent nav aid which is on the same bearing as the approach track (T/M)

Back 30

Head Bearing

Front 31

radius

Back 31

Distance from the hawsepipe to the pelorus

Front 32

Swing Circle

Back 32

Length of ship + amount of chain veered out

Front 33

Drag Circle

Back 33

Amount of chain veered out + distance from hawspipe to the pelorus

Front 34

A bearing that marks anchor drop point

Back 34

Letting go bearing

Front 35

If a ships fix is outside the drag circle

Back 35

the ship is...

Front 36

1200

Back 36

1500

Front 37

Pre-Anchorage Considerations (6)

Back 37

-water depth

Front 38

Accurate method for designating anchorages

Back 38

bearing and range to a nav aid

Front 39

Less accurate method for designating anchorages

Back 39

latitude and longitude

Front 40

Post-Anchorage Considerations (4)

Back 40

-enough anchor chain (5-7 times water depth)

Front 41

Is it ideal to head into the wind and current while going to anchor

Back 41

YES

Front 42

Plotting the anchorage

Back 42

1- predict wind/current

Front 43

Plotting at anchor

Back 43

1- take a fix