manual radar plotting  latcrewcompass.lv · plotting has two main tasks: •it can show whether...
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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 pass 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 Perform Manual Radar Plotting

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
3.5 Report radar plot data
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
3.5 Report radar plot data
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
3.5 Report radar plot data
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  
3.5 Report radar plot data
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