Chapter 8: Installation 8-17
Radar System Checks
and Adjustments
Transmission Check
WARNING:
The radar scannertransmits electromagneticenergy.Ensurethat the
scannerhasbeeninstalledaccordingtotherecommendationsgiveninthe
PathfinderPlusRadarScannerOwner’sHandbook,andthatallpersonnel
areclearof the scanner,beforeswitching totransmit mode.
Ensurethe displayunit is in Radar mode.
To switch to transmit mode, press and releasethe POWER key. The antenna
sweepshould startto build up the radar picture.
Run throughthe operations described in Chapter 3 and check that all the
expected data is displayed.
Bearing Alignment
When the systemis correctlyinstalled, you must check the bearingalignment
to ensure that targetsappear at their correctbearing relativeto the ship’s bow,
and adjust the alignment if necessary.
To adjustthe alignment,you need to select a visible targetof known bearing
that is displayed on the radar, and then use the setup options to adjust the radar
until the correctbearing reading is obtained.
➤ To determinethe alignmenterror, use one of the methods detailedbelow.
1. Visually identify a suitabletarget, such as a buoy that canbe seen towards
the edgeof the radar screen.Typically, thiswill be on the 1.5 nm range.
2. If thevessel is moored:
i. Determine the accurate bearingof the target relative to the ship’s bow
with the aid of a hand bearingcompass. i.e. Subtract the ship’s head
bearingfrom the targetvisual bearing.
Example 1
Visual bearing= 065 °M
Ship’s head= 021
°M
Relative bearing= 044°R
Example 2
Visual bearing = 030°M
Ship’s head= 042
°M
Relative bearing= -012°(+360) = 348°R
ii. Measure the relative bearingof the target on the radar using an EBL.
iii. Ifthere is a differencein the two bearings (alignmenterror), adjust the
radaras detailedbelow.
If the vesselis under way (in reasonably calm conditions):
81186_3.book Page 17 Thursday, August 22, 2002 8:23 AM
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