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Capt. Arnel Malaga RADAR PLOTTING TECHNIQUES RADAR PLOTTING TECHNIQUES STBY/ON
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Page 1: Radar Plotting Techniques

Capt. Arnel Malaga

RADAR PLOTTING TECHNIQUESRADAR PLOTTING TECHNIQUES

STBY/ON

Page 2: Radar Plotting Techniques

Capt. Arnel Malaga

STBY/ON

Radar plotting tips, radar plotting made Radar plotting tips, radar plotting made easyeasy

  Radar Plotting FormulasRadar Plotting Formulas

Distance “r" to “m"Time to C.P.A. = “m" to C.P.A. x Plotting Interval

60“e" to “r" = Own ships speed x Plotting interval

Target Course = “e" through Centre of “m"

Minutes from “r" to “m"Target speed = Distance from “e" to “m" x 60

Page 3: Radar Plotting Techniques

Capt. Arnel Malaga

STBY/ON

Minutes from “r" to m" Minutes from “r" to m" Rate of Tide = Rate of Tide = Distance from “m" to “e" x 60Distance from “m" to “e" x 60

Set = Direction from “m" to “e"Set = Direction from “m" to “e"

Drift = Distance from “m" to “e"Drift = Distance from “m" to “e"

Tidal problems using RadarTidal problems using Radar

Page 4: Radar Plotting Techniques

Capt. Arnel Malaga

STBY/ON

BASIC RADAR BASIC RADAR PLOTPLOT

Warning ! ! !Warning ! ! !

• Watch to see if you are using Watch to see if you are using Relative or True Compass Relative or True Compass Bearings.Bearings.

• Using a relative bearing is how Using a relative bearing is how you would take a compass you would take a compass bearing of another vessel. bearing of another vessel.

Page 5: Radar Plotting Techniques

Capt. Arnel Malaga

STBY/OFF

EXIT

Page 6: Radar Plotting Techniques

Capt. Arnel Malaga

STBY/ON

Page 7: Radar Plotting Techniques

““r” r” is the target’s first plotis the target’s first plot

rr

ee

Own Ship Own Ship Course & Course &

SpeedSpeed

Single Single TargetTarget

The direction and length of the The direction and length of the points points “e “e r” r” is your own ship is your own ship

course and speedcourse and speed

Capt. Arnel Malaga

Page 8: Radar Plotting Techniques

rr

mm ee

““r r m” m” is the target’s relative motionis the target’s relative motionwhere:where:

- relative course is the direction- relative course is the direction- relative speed is the length of - relative speed is the length of r r m m / the time interval/ the time interval

““m” m” is the target’s second plotis the target’s second plot

Own Ship Own Ship Course & Course &

SpeedSpeed

Capt. Arnel Malaga

Page 9: Radar Plotting Techniques

rr

mm ee

““e e m” m” is the target’s true motionis the target’s true motionwhere:where:

- target course is the direction- target course is the direction- target speed is the length of - target speed is the length of e e m m / the time interval/ the time interval

Target Target CourseCourse

Target Target Speed=Dist/TimSpeed=Dist/Tim

e Intervale Interval

Capt. Arnel Malaga

Page 10: Radar Plotting Techniques

Capt. Arnel Malaga

AVOIDANCE AVOIDANCE COURSECOURSE

Page 11: Radar Plotting Techniques

rr

mm ee

““rx rx m” m” is the target’s new relative motion lineis the target’s new relative motion linewhere:where:

- the direction is the target’s new direction of- the direction is the target’s new direction ofrelative motionrelative motion

- target new relative speed is the length of - target new relative speed is the length of rx rx m m / the time interval/ the time interval

Capt. Arnel Malaga

mmxx

rxrx

AvoidancAvoidance Coursee Course

BNCPBNCPAA

NCPNCPAA

NDRNDRMM

““mx” mx” is the point of execution of avoidanceis the point of execution of avoidance

““eerx” rx” is the avoidance courseis the avoidance course

Page 12: Radar Plotting Techniques

Capt. Arnel Malaga

AVOIDANCE SPEEDAVOIDANCE SPEED

Page 13: Radar Plotting Techniques

rr

mm ee

““rx rx m” m” is the target’s new relative motion lineis the target’s new relative motion linewhere:where:

- the direction is the target’s new direction of- the direction is the target’s new direction ofrelative motionrelative motion

- target new relative speed is the length of - target new relative speed is the length of rx rx m m / the time interval/ the time interval

Capt. Arnel Malaga

mmxx

rxrx

BNCPBNCPAA

NCPNCPAA

NDRNDRMM

““mx” mx” is the point of execution of avoidanceis the point of execution of avoidance

““eerx” rx” is the avoidance speedis the avoidance speed

Page 14: Radar Plotting Techniques

Capt. Arnel Malaga

MULTIPLE TARGETSMULTIPLE TARGETS

Page 15: Radar Plotting Techniques

Capt. Arnel Malaga

rr

ee

mmrxrx

mmxx

STBY/ON