Radar

Question 1

2 inputs for radar?

Answer 1

Heading & speed

Question 2

LRIT?

Answer 2

Long Range Identification Tracking

Satellite position every 6 hours

Question 3

Pulse length:
SP
MP
LP

Answer 3

Short pulse - >6M
Medium pulse - 6M
Long pulse - 6M+

Question 4

X Band:
Wavelength
Frequency
Use

Answer 4

3cm
9GHz
Navigation

Question 5

S Band:
Wavelength
Frequency
Use

Answer 5

10cm
3GHz
Collision avoidance

Question 6

Sea clutter control?

Rain clutter control?

Answer 6

SC: Reduces gain from the center out

RC: Does not display leading edge returns (blocks out weather to return signals from vessels) FAST TIME CONSTANT CONTROL

Question 7

Define blind sector and how you would find it when joining a vessel:

Answer 7

Part of ships equipment or landmass that blocks the return of signals.

Increase GAIN on a rough day and notice which area doesn’t receive good returns.

Question 8

Factors affecting detection?

Answer 8

MASST

MATERIAL
ASPECT
SHAPE
SIZE
TEXTURE

Question 9

Considerations for taking radar bearings of charted objects?

Answer 9

Vertical slopes, objects that give a good return (big building instead of a tree or a beach)

Question 10

Racon:

Answer 10

Signal CLOSEST to center of radar screen is location of Racon

Question 11

Radar setup:
MGN379

(5)

Answer 11

BRGTC

Brilliance (brightness)
Range (appropriate)
Gain (light speckles on display)
Tuning (produce wash on calm day)
Clutter (sea & rain)

Question 12

Radar checklist:
MGN379

(4)

Answer 12

Operation (@ all times: Nav / Col. av.)

Performance monitor (transmitter)

VRM (matches range rings)

EBL (heading marker against GYRO)

Question 13

Good radar practice:
BPG

(6)

NB

Answer 13

Performance Monitor frequently checked (if fitted)

Misalignment of heading marker checked

Small targets (vessels, ice, debris) may not help detected)

Video processing techniques used with care

Obscured echoes: Rain or Sea clutter

Blind or shadow sectors

Question 14

2 ways of testing HEADING MARKER?

Answer 14

Heading marker vs GYRO heading

Radar C UP -> Point ship @ small distinct object vs heading marker

Question 15

Speed settings for collision avoidance & navigation?

Answer 15

Collision Avoidance: STW (sea stab)

Navigation: SOG (ground stab)

Question 16

Is Head Up stabilised?
What function is it not good for?

Answer 16

No, unstabilised (no gyro input).

NOT good for collision avoidance or PI’s as EBL moved as ship yaws.

Question 17

Is North Up stabilised?

Answer 17

Yes, has Gyro input, heading markers moves.

Good for collision avoidance.

Question 18

Is Course Up stabilised?

Answer 18

Yes, has Gyro input.

Question 19

Operation for testing PM:

Answer 19

Menu ~> Echo ~ “PM”