Auto Mode: Automatic Station Selecting Function - Furuno NX-700B Service Manual

1.2.2 Auto mode: Automatic station selecting function

When a position data is entered, the Auto mode can be used. The range of the selection
is specified in "Area: nm" in the NAVTEX Station List of the Operator's Manual.
Note:
The information on the service area of each station is extracted from the Cost station
List issued by the ITU. For example, the service area of Yokohama is 400 nm. The area
of 800 nm with this station at the center is the area to allow Auto mode.
In Serapeum in Egypt, the frequency of 4209.5 kHz is used but "Area: nm" is not
specified because it is in the HF band.
NVTEX
Station
1. A user can switch between Auto mode: Automatic station selecting and Manual
mode: Manual station selecting modes.
2. The Auto mode is switched between 518 kHz/490 kHz and 518 kHz/4209.5 kHz with
the two frequencies in pairs. Auto mode is not available for each frequency
separately.
3. The positions, IDs, service area ranges of NAVTEX stations are stored in the
nonvolatile memory.
4. The entry of position information is required to enable the Auto mode.
When there is no input of position information
1) Messages from all NAVTEX stations are received (All stations selected)
When there is an input of position information
1) When the own ship is located within the service area of a NAVTEX station,
the ship receives messages from the NAVTEX station. Otherwise, messages
from the NAVTEX station are not received.
2) When the own ship is located in an area where service areas of multiple
NAVTEX stations are overlapped, broadcasting from NAVTEX stations of
these service areas is received.
3) When the own ship is not in any of service areas, messages from all NAVTEX
stations are received (All stations selected).
4) When the own ship is located in the service area of a NAVTEX station that
broadcasts only at 518 kHz, all NAVTEX stations are selected on 490 kHz.
5) When the own ship is located in the service area of a NAVTEX station that
broadcasts only at 490 kHz, all NAVTEX stations are selected on 518 kHz.
6) In Auto mode, all NAVTEX stations are selected by receiving at 4209.5 kHz.
Because it is the HF band that the service area is not specified by the
propagation of ionosphere.
Range
Fig. 1.2.3 Auto mode area
1-6
1.2 Operation Guide