Bedienungsanleitung Furuno 1942 (Seite 53 von 63) (Englisch)

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AP-7

TCPA is the time to CPA measured with

present speeds of own ship and the targets.

Both CPA and TCPA are automatically cal-

culated. When a target ship has passed clear

of own ship, the CPA is displayed and the

TCPA appears as "**.*". TCPA is counted up

to 99.9 min. and beyond this it is indicated as

TCPA>99.9 min.

Mode and length of Vectors

True or Relative Vector

Target vectors are displayed in relative or true

mode. Own ship does not have a vector in rela-

tive mode.

Vector Length

From the ARP-10 MENU, Vector Length can

be set to 30 seconds, 1, 3, 6, 15 or 30 minutes

and the selected vector time is indicated on

the screen.

The vector tip shows an estimated position of

the target after the selected vector time

elapses. It can be valuable to extend the vec-

tor length to evaluate the risk of collision with

any target.

Past position Display

The Auto Plotter displays equally time-spaced

dots (maximum 5 dots) marking the past po-

sitions of any targets being tracked.

If a target changes its speed, the spacing will

be uneven. If it changes the course, its plotted

course will not be a straight line in TM mode.

Operational Warnings

There are two main situations which cause the

Auto plotter to trigger visual and audible

alarms.

• CPA/TCPA alarm

• Lost target alarm

CPA/TCPA Alarm

Visual and audible alarm are generated when

the predicted CPA and TCPA of any target

become less than their preset limits. The au-

dible alarm continues for 10 seconds.

The Auto plotter ARP-10 continuously moni-

tors the predicted range at the Closest Point

of Approach (CPA) and predicted time to CPA

(TCPA) of each tracked target to own ship.

When the predicted CPA of any target be-

comes smaller than a preset CPA alarm range

and its predicted TCPA less than a preset

TCPA alarm limit, the ARP-10 releases an

audible alarm. In addition, the target plot sym-

bol changes to a triangle and flashes together

with its vector.

Provided that this feature is used correctly, it

will help prevent the risk of collision by alert-

ing you to threatening targets. It is important

that GAIN, A/C SEA, A/C RAIN and other

radar controls are properly adjusted and the

Auto Plotter is set up so that it can track tar-

gets effectively.

CPA/TCPA alarm ranges must be set up prop-

erly taking into consideration the size, ton-

nage, speed, turning performance and other

characteristics of own ship.

WARNING

The CPA/TCPA alarm feature should

never be relied upon as a sole means for

detecting the risk of collision.

The navigator is not relieved of the

responsibility to keep visual lookout for

avoiding collisions, whether or not the

radar or other plotting aid is in use.

Follow the steps shown below to set the CPA/

TCPA alarm ranges:

1. Open the "ARP-10 MENU".

2. On the "CPA Set" line, select a CPA limit

desired. (Off, 0.5, 1, 2, 3, 5, 6 nm)

3. Press the [ACQ/ENTER] key.

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Furuno 1942 Seite 53

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