MANUAL RADAR PLOTTING - latcrewcompass.lv · Plotting has two main tasks: •It can show whether...

transcript

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

•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

Principles of relative motion

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.

Plotting 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

OwnDATA

T A R G E T S

A B C D

Course

Speed kts

CPA / TCPA

New CPA

New course

New speed

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

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 - -

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

MANUAL RADAR PLOTTING - latcrewcompass.lv · Plotting has two main tasks: •It can show whether...

Documents