Furuno NAVNET 1823C Manuel d'utilisateur télécharger pdf (Page 70)

2. RADAR OPERATION

2-34

2.26 ARP, TTM Operation

When the radar source is an ARP-equipped Model 1800/1900 series network

radar, you can manually and automatically acquire and track ten targets. Once a

target is acquired automatically or manually it is automatically tracked within 0.1

to 32 nm. If the FURUNO heading sensor PG-1000 is used, the data sentence

“RMC” is necessary.

Alternatively, you can display the tracks of other ships by receiving the data

sentence TTM (Tracked Target Message) via the NETWORK or NMEA port on

the display unit. However, targets cannot be acquired.

Note: When using your unit as remote display, you cannot change the range of

the main radar at the remote display. For the target acquisition, set the

range individually.

Usage precautions for ARP

WARNING

No one navigational aid should be relied

upon for the safety of vessel and crew.

The navigator has the responsibility to

check all aids available to confirm

position. Electronic aids are not

a substitute for basic navigational

principles and common sense.

• This auto plotter automatically tracks an

automatically or manually acquired radar

target and calculates its course and

speed, indicating them by a vector. Since

the data generated by the auto plotter

are based on what radar targets are

selected, the radar must always be

optimally tuned for use with the auto

plotter, to ensure required targets will not

be lost or unwanted targets such as sea

returns and noise will not be acquired

and tracked.

• A target does not always mean a land-

mass, reef, ships or other surface vessels

but can imply returns from sea surface

and clutter. As the level of clutter changes

with environment, the operator should

properly adjust the A/C SEA, A/C RAIN

and GAIN controls to be sure target

echoes are not eliminated from the

radar screen.

CAUTION

The plotting accuracy and response of

this auto plotter meets IMO standards.

Tracking accuracy is affected by the

following:

• Tracking accuracy is affected by course

change. One to two minutes is required to

restore vectors to full accuracy after an

abrupt course change. (The actual

amount depends on gyrocompass

specifications.)

• The amount of tracking delay is inversely

proportional to the relative speed of the

target. Delay is on the order of 15-30

seconds for high relative speed; 30-60

seconds for low relative speed.

Display accuracy is affected by the

following:

• Echo intensity

• Radar transmission pulsewidth

• Radar bearing error

• Gyrocompass error

• Course change (own ship or target)

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Furuno NAVNET 1823C Manuel d'utilisateur Page 70

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