Simrad ARGUS FMCW 3G, User Manual

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Basic operation | Argus Radar Operator Manual
Help line section
The function of the Help line (See “System data area sections” on page 23) is to make sug-
gestions to the operator on the actual functions of three function buttons. The main functions
are described in “The three function keys on the keyboard” on page 29.
Operating mode section
There are two switch buttons under the help line (See “System data area sections” on page
23) with which it is possible to select “Track Mode” or “PPI Mode”. The Help line will change
consequently (See “The three function keys on the keyboard” on page 29).
Cursor section
In the Cursor Section (See “System data area sections” on page 23) of the system data area
all the parameters relevant to the cursor are displayed. The information displayed are de-
scribed in the following sub-paragraph.
Cursor
The Cursor Polar Position (Range and Bearing) is displayed and it can be switched between
True and Relative. Obviously, if the gyro is faulty, the True information is not available.
Latitude and Longitude or ETA and TTG
These fields normally indicate the Geographic position of the cursor (Cursor must be inside
PPI area and valid EPFS data available).
The EPFS position depends also of the datum (DTM) used.
The DTM sentence is processed and evaluated. Latitude and longitude will not be accepted
and presented when:
•
the reference datum is different from WGS-84,
•
no datum has been received or the offset is missing and the local reference is not WGS-84.
The position background changes to yellow when the local datum is different from WGS-84
and the latitude and longitude are changed according to the datum offset.
ETA and TTG to the cursor position can be calculated and displayed. And the switch between
the two presentations can easily be performed moving the trackball on the “Latitude” and
“Longitude” labels and watching at the Help line. The Help line related to the left SK will indi-
cate “ETA/TTG” (in case the presentation is already for ETA and TTG it will indicate “Lat/Lon”).
In ETA and TTG mode the system will indicate the estimated date and time of the eventual
arrival at the point where the cursor is placed (ETA, expressed in hh-mm dd-mm-yyyy) and the
time needed to arrive at that point (TTG, expressed in dd hh-mm).
To display ETA and TTG the cursor must be placed inside the PPI at a bearing of ±45° relative
to own ship course.
¼
Notes:
•
The ETA can be displayed only if an external time source is connected (i.e. GPS) or a manual
date and time are set.
•
Both ETA and TTG are not displayed if the speed source is at fault or if the speed is lower than
0.1 KT.