Radar Plotting Techniques
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Transcript of Radar Plotting Techniques
Capt. Arnel Malaga
RADAR PLOTTING TECHNIQUESRADAR PLOTTING TECHNIQUES
STBY/ON
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
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
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.
Capt. Arnel Malaga
STBY/OFF
EXIT
Capt. Arnel Malaga
STBY/ON
““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
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
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
Capt. Arnel Malaga
AVOIDANCE AVOIDANCE COURSECOURSE
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
Capt. Arnel Malaga
AVOIDANCE SPEEDAVOIDANCE SPEED
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
Capt. Arnel Malaga
MULTIPLE TARGETSMULTIPLE TARGETS
Capt. Arnel Malaga
rr
ee
mmrxrx
mmxx
STBY/ON