6 Commands
72
6.65.2
Setting the types of messages required
If the default setting is not appropriate to ones wishes, the message types can be set
directly by typing the appropriate letter(s) after the
NAVtex
command:
cmd:
NAV
ACBL <Return>
The example quoted will allow "Navigational Warnings", "Meteorological Warnings" and
"Ice Reports" to be received. All other message types are ignored by the PTC. It is
essential that no spaces are present between the letters. The order of the letters however is
unimportant.
The argument "ALL" is a special argument which allows ALL message types to be
received instead of typing in a long list of letters.
cmd:
NAV
ALL <Return>
The two arguments “
Maximum number of entries in the NAVTEX directory”
and “
List of
letters for choosing the message types”
can be entered together. The order of input is of
no importance. E.g.:
cmd:
NAV
ABDE 50 <Return>
cmd:
NAV
70 CDEF <Return>
cmd:
NAV
ALL <Return>
6.65.3
Choice of the message area codes
If one wishes to receive messages from a few special coast stations, these can be set by
using the command
NAV AREA
. This can often be a useful choice, as a skipper in the
Mediteranean Sea will have (presumably) no interest in navigational messages concerning
the North Sea or Baltic. The area codes allocated to the individual coast stations can be
easily found out by inspecting the message contents.
If one wishes to receive messages from coast stations M, N and Z, then the PTC is
informed of this with the command
NAV AREA
<Enter>.
cmd:
NAV
AREA
MNZ <Return>
The order of the letters is unimportant. Again however, there should be no spaces
between the letters.
The special argument "ALL" is also allowed here. The command
cmd:
NAV
AREA
ALL <Return>
allows the reception of messages from all areas. The command
cmd:
NAV
AREA
<Return>
without an argument displays the present area codes chosen.
6.65.4
Choosing the message latency time
A somewhat advanced setting possibility allows the PTC-IIIusb to decide after what time
period the message is no longer valid. This command is the argument "
DAYS
" which may
follow the
NAVtex
command. It can contain a number between 0 and 365. This sets the
