3 Manual Radar Plotting 612u6c

3 Perform Manual Radar Plotting

MANUAL RADAR PLOTTING

3 Perform Manual Radar Plotting

Plotting has two main tasks: • It can show whether danger of collision exists, how close we will the target and how much time is left

3 Perform Manual Radar Plotting

•Approximate determination of the course and speed of the other vessel, so avoiding action can be taken when needed

3.1 Construct the relative motion triangle

Vector

3.1 Construct the relative motion triangle

Vectors sum

3.1 Construct the relative motion triangle

3.1 Construct the relative motion triangle

Vectors sum

3.1 Construct the relative motion triangle

Principles of relative motion

3.1 Construct the relative motion triangle

3.1 Construct the relative motion triangle Эффект Допплера

Если источник излучения движется по направлению к приёмнику, то есть догоняет испускаемые им волны, то длина волны уменьшается, а частота растет и наоборот.

3.1 Construct the relative motion triangle

Plotting triangle

3.2 Determine course, speed and aspect of other ships

Plotting elements

3.3 Determine A and TA

3.4 Recognize the effect of course and speed changes

3.4 Recognize the effect of course and speed changes

3.4 Recognize the effect of course and speed changes

3.4 Recognize the effect of course and speed changes

3.4 Recognize the effect of course and speed changes

3.5 Report radar plot data

Fixing plotting exercise data Own

TARGETS

DATA A Course

Speed kts A / TA New A New course

New speed T man

B

C

D

3.5 Report radar plot data

Fixing own ship data Own

TARGETS

DATA

ship

A

125°

Course

12.6

Speed kts A / TA New A New course

New speed T man

B

C

D

3.5 Report radar plot data

Fixing target plotting data Own

TARGETS

DATA

ship

A

B

125°

Course

215°

005°

12.6

Speed kts

14.8

6.3

A / TA

0.2 / 14m 0.8 / 10m 2 nm

2.2 nm

New course

-

-

New speed

-

-

New A

T man

C

D

3.5 Report radar plot data

Fixing own ship data changes Own

TARGETS

DATA

ship

A

B

125°

Course

215°

005°

12.6

Speed kts

14.8

6.3

A / TA New A

0.2 / 14m 0.8 / 10m 2 nm

2.2 nm

155°

New course

-

-

12.6

New speed

-

-

9 min

T man

-

-

C

D

Plotting in true motion mode

ARPA in true motion mode

ARPA in true motion mode A Vt Vt

6

4

2

Vr

A Vt

Vt