# manual radar plotting - latcrewcompass.lv · plotting has two main tasks: •it can show whether...

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Author: lamkiet

Post on 02-Aug-2018

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PLOTTING

• Plotting has two main tasks:

It can show whether danger of collision exists, how close we will pass the target and how much time is left

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

• 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

• , , , .

3.1 Construct the relative motion triangle

• Plotting triangle

3.1 Construct the relative motion triangle

• Plotting elements

3.2 Determine course, speed and aspect of other ships

• 3.3 Determine CPA and TCPA

• 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

• OwnDATA

T A R G E T S

A B C D

Course

Speed kts

CPA / TCPA

New CPA

New course

New speed

T man

Fixing plotting exercise data

• OwnDATA

T A R G E T S

ship A B C D

125 Course

12.6 Speed kts

CPA / TCPA

New CPA

New course

New speed

T man

Fixing own ship data

• OwnDATA

T A R G E T S

ship A B C D

125 Course 215 005

12.6 Speed kts 14.8 6.3

CPA / TCPA 0.2 / 14m 0.8 / 10m

New CPA 2 nm 2.2 nm

New course - -

New speed - -

T man

Fixing target plotting data

• OwnDATA

T A R G E T S

ship A B C D

125 Course 215 005

12.6 Speed kts 14.8 6.3

CPA / TCPA 0.2 / 14m 0.8 / 10m

New CPA 2 nm 2.2 nm

155 New course - -

12.6 New speed - -

9 min T man - -

Fixing own ship data changes

• Plotting in true motion mode

• ARPA in true motion mode

• 246

ARPA in true motion mode

CPA

CPA

Vt Vt

Vr

Vt

Vt