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Old 02-06-2021, 18:10   #1
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Navtex Plugin

MGrouch's idea

https://github.com/astuder/dAISy/issues/11
based on success of dAISy AIS might be you could make
a small NavTex receiver connectable
via USB. And outside antenna. There is one NASA Marine PC NavTex USB
which is way too expensive.

There is software too to display messages https://github.com/juerec/pc-navtex
The program PC NAVTEX works together with the NAVTEX receiver "PC NAVTEX USB" from NASA.
You can download, read and store messages received by this device.
PC NAVTEX ist tested under Linux systems, on PC and on Raspberry Pi 3B+.
Other platforms possible too. The program is written using the Qt framework. There no platform specific features used. So, a port to Windows should be able without any changes.


This would be a good resource. Are the channels for AIS adequate?

I think Navtex is somewhat different frequencies however


https://www.google.com/search?client...ex+frequencies


NAVTEX broadcasts are primarily made on the medium frequencies of 518 kHz and 490 kHz. The international NAVTEX frequency is 518 kHz, and these broadcasts should always be in English. National transmission of NAVTEX, where supported, uses 490 kHz specifically for broadcasts in local languages.


This might be an ideal addon to weatherfax_pi
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Old 27-11-2021, 06:53   #2
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Re: Navtex Plugin

I like this idea :-)
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Old 27-11-2021, 08:00   #3
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Re: Navtex Plugin

The trouble is you need a medium frequency receiver and the fellow who makes the dAISy AIS receivers decided it would not be worthwhile.

(medium frequencies of 518 kHz and 490 kHz.)
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Old 27-11-2021, 15:01   #4
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Re: Navtex Plugin

Well, yes. I'm also not sure how big the demand is in these times of Internet.

Inbetween I bought a used Weather Infobox WIB3
WIB3
to play around a little bit...
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Old 27-11-2021, 15:03   #5
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Re: Navtex Plugin

Well, yes. I'm also not sure how big the demand is in these times of Internet.

Inbetween I bought a used Weather Infobox WIB3 to play around a little bit...
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Old 28-11-2021, 10:48   #6
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Re: Navtex Plugin

NAVTEX fills a similar void to that filled by WeFAX on HF, i.e. when out of range of VHF, WiFi, mobile phone networks, satellite, etc.
There is no problem tuning NAVTEX, WeFAX, RTTY weather reports, SYNOP, and AIS on the same RTL-SDR V3, i.e. MF thru' to VHF, and even UHF. MF and HF can use the rigging as an antenna, and AIS will tune on the marine VHF antenna. The app MULTIPSK can tune these devices directly and also decode NAVTEX, WeFAX, RTTY, SYNOP and more. OpenCPN WeFAX plugin for Windows needs an audio signal piped to it, but it's digital processing is better than any of the other apps I've used. And it's automated scheduler is also a bonus.
As has been mentioned elsewhere on the forum, smartphone apps are available to decode the audio for NAVTEX etc that is tuned on a broadcast radio fitted with a BFO circuit, but they are not as user friendly and the quality of the output is poor.
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Old 28-11-2021, 11:15   #7
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Re: Navtex Plugin

This is very interesting Weatherinfobox
What was the cost?


MULTIPSK index and https://www.dxzone.com/dx8464/multipsk.html
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Old 28-11-2021, 12:03   #8
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Re: Navtex Plugin

I bought a used one via ebay so I got it for 200 (225US$).
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Old 28-11-2021, 15:59   #9
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Re: Navtex Plugin

MULTIPSK also decodes NMEA frames from AIS and ADS-B which some users send to OpenCPN and Google Earth. With this compatibility and versatility it would seem that a good amount of short circuiting rationalization and efficiency could be achieved by formalizing the link up procedure for day to day users. See recent msg on the MULTIPSK forum, multipsk@groups.io, from it's designer:

From: Patrick Lindecker
Sent: November 3, 2021 3:25 PM
To: multipsk@groups.io
Subject: Re: [multipsk] ADS-B/NEMA GPS Frames
Hello Jeremy,
When you open the Windows task manager, at how much is the physical memory?
>I tried installing a virtual comport program com0com, which upon installation installed com ports on 3 & 4. I was then able to select say com port 3. >However when I selected com port 3 on OpenCPN (destination application) serial connection, alarm bells went off and I saw many small windows

Of course if you select serial number 3 on Multipsk, you should select the serial number 4 on OpenCPN.
Note: with Googleeath, this function works well:
- if the "GPS" button is pushed, all the received ADS-B positions are transmitted, via a $GPGGA NMEA GPS frame, to any cartography application able to manage GPS frames in real time (as Google Earth). The user must first select a serial port (physical or virtual) in the "Serial port for GPS" menu, on the Configuration screen.
For an application on the same PC, it will be necessary to install a virtual serial link with 2 serial ports (with the "Com0com" program for example). A serial port will be configured on Multipsk and the other will be scaned by the cartography application. Note that the plane identifier is not transmitted via the GPS frame.

Note: to start the real time GPS tracking on Google Earth, it is necessary to:

click on "Tools > GPS",
click on "Realtime",
check "NMEA",
set the polling interval to 1 second,
check "Automatically follow the path",
click on "Start".

See https://support.google.com/earth/answer/148095?hl=en for more information.

73

Patrick
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Old 28-11-2021, 22:17   #10
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Re: Navtex Plugin

Quote:
Originally Posted by Thonglor View Post
Well, yes. I'm also not sure how big the demand is in these times of Internet.



Inbetween I bought a used Weather Infobox WIB3 to play around a little bit...
They come with a little Windows program to display messages and barograh data. I never bothered, but it shouldn't be too difficult to reengineer this for other platforms.
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Old 29-11-2021, 11:28   #11
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Re: Navtex Plugin

Quote:
Originally Posted by Maelruan View Post
MULTIPSK also decodes NMEA frames from AIS and ADS-B which some users send to OpenCPN and Google Earth. With this compatibility and versatility it would seem that a good amount of short circuiting rationalization and efficiency could be achieved by formalizing the link up procedure for day to day users. See recent msg on the MULTIPSK forum, multipsk@groups.io, from it's designer:

From: Patrick Lindecker
Sent: November 3, 2021 3:25 PM
To: multipsk@groups.io
Subject: Re: [multipsk] ADS-B/NEMA GPS Frames
Hello Jeremy,
When you open the Windows task manager, at how much is the physical memory?
>I tried installing a virtual comport program com0com, which upon installation installed com ports on 3 & 4. I was then able to select say com port 3. >However when I selected com port 3 on OpenCPN (destination application) serial connection, alarm bells went off and I saw many small windows

Of course if you select serial number 3 on Multipsk, you should select the serial number 4 on OpenCPN.
Note: with Googleeath, this function works well:
- if the "GPS" button is pushed, all the received ADS-B positions are transmitted, via a $GPGGA NMEA GPS frame, to any cartography application able to manage GPS frames in real time (as Google Earth). The user must first select a serial port (physical or virtual) in the "Serial port for GPS" menu, on the Configuration screen.
For an application on the same PC, it will be necessary to install a virtual serial link with 2 serial ports (with the "Com0com" program for example). A serial port will be configured on Multipsk and the other will be scaned by the cartography application. Note that the plane identifier is not transmitted via the GPS frame.

Note: to start the real time GPS tracking on Google Earth, it is necessary to:

click on "Tools > GPS",
click on "Realtime",
check "NMEA",
set the polling interval to 1 second,
check "Automatically follow the path",
click on "Start".

See https://support.google.com/earth/answer/148095?hl=en for more information.

73

Patrick
Maybe I don't get it - what are you trying to say?
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Old 29-11-2021, 17:59   #12
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Re: Navtex Plugin

Thonglor,
As OpenCPN already displays data from NMEA 0183 sentences, WeFAX, etc, received via $20 rtl-sdr dongles, other data decoded by MULTIPSK from SYNOP/SHIP reports and weather balloons might also be plotted or displayed as appropriate. At present, OpenCPN on Linux can control these dongles, but the Windows version cannot. MULTIPSK could be the solution for the Windows version, and also provide a range of other modes all from one app. A clear set of instructions to achieve a link up like that shown by the MULTIPSK user would be welcome for day to day users like me.
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Old 01-12-2021, 14:34   #13
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Re: Navtex Plugin

But Navtex doesn't come as NMEA stream - so where's the relation?
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Old 01-12-2021, 18:27   #14
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Re: Navtex Plugin

Quote:
But Navtex doesn't come as NMEA stream - so where's the relation?
It's all ASCII text !

On a serious note, it would take a lot of programming effort and computing power to perform the natural language processing to geoparse something like:
Code:
SECURITE
FM JRCC AUSTRALIA 160429Z NOV 21
AUSCOAST WARNING 261/21
DRILL RIG OCEAN ONYX/V7EB9 IN POSITION 39-12.50S 142-52.48E
2.5 NM CLEARANCE REQUESTED.
NNNN
or
Code:
40:2:1:31:11:01:00
IDY10240
SECURITE

High Seas Forecast for Northern METAREA 8/10/11
NORTHERN AREA: EQUATOR TO 12S, 90E TO 142E AND SOUTHWARD TO COAST, 125E TO 142E

Issued by the Australian Government Bureau of Meteorology
For 24 hours commencing 2300 UTC 1 December 2021

Part 1 Warnings
TCWC Gale Warning for TC Teratai.

Part 2 Situation at 1800 UTC
Trough 06S090E 06S099E to Tropical Cyclone Teratai 997hPa near 09.9S101.9E,
forecast 04S090E 05S096E to Low 1002hPa near 9.5S100.2E at 030000UTC.

Part 3 Forecast
Refer to latest warnings.

Within 180nm of Tropical Cyclone/Low, outside warning area:
Clockwise winds 20/33 knots. Rough to very rough seas. Moderate swell.

Remainder:
Winds not exceeding 20 knots. Slight to moderate seas. Low swell, increasing to
low to moderate swell south of line 07S090E 05S098E 12S112E.

Scattered showers and isolated thunderstorms across much of the area.
Widespread showers and scattered thunderstorms within 240nm of Tropical
Cyclone/Low. Visibility reducing below 2nm in precipitation.

Please be aware
Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger
than the forecast, and stronger still in squalls and thunderstorms. Maximum
waves can be twice the forecast height.

WEATHER MELBOURNE

The next routine forecast will be issued at 07:15 UTC Thursday.
or
Code:
CQ CQ CQ DE DDK2 DDH7 DDK9
FREQUENCIES 4583 KHZ 7646 KHZ 10100.8 KHZ
RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY
ZCZC 535 
FQMM78 EDZW 250600
WEATHER AND SEA BULLETIN FOR WESTERN MEDITERRANEAN SEA
ISSUED BY MARINE WEATHER SERVICE HAMBURG
25.09.17, PP UTC:
GENERAL SYNOLTIC SITUATION:
LOW 1002 TAURUS, NEARLY UNCHANGED. THUNDERY LOW 1016
ADRIATIC SEA-IONIAN SEA, MOVING EAST A LITTLE. HIGH 11
WEST OF PORTUOZL TO 
OROWLGERIA, EASTERN PART MOVING
NORTH. IN THE REMAINING MEDITERRANEAN SEA ONLY SMALL
PRESSURE DIFFERENCES. WAVY ICELANDFRONTAL TROUGH 1018 BAY
OF BISCAY, WEAKENING, MOVING EAST.
DWD FORECAST OF MO/25/09.2017 PP UTC:
WIND FORCE: BEAUFORT, WVE HEIGHT: METRE
ABORAN (36.0N 2.3W) ST: WE C
MO 25. QWZ: SW-W 2-3 PMT M //
MO 25. QIZ: W 2-3 PMT M //
TU 2". PPZ: SW 2-3 PMT M //
TU 26. PYZ: SW-W 2-3 PMT M //
TU 26. QWZ: NZ-E 0-2 PMT M //
TU 26. QIZ: NE-E 2-3 PMT M //
WE 27. PPZ: NE-E 2-3 PMT M //
PALOS (37.0N 0.0E) SST: WR C
MO 25. QWZ: SW-W 4 PMT M //
MO 25. QIZ: SW-W 3-4 PMT M //
TU 26. PPZ: SW 3-4 PMT M //
TU 26. PYZ: W 0-2 PMT M //
TU 26. QWZ: S-SW 0-2 Q M //
TU 26. QIZ: NE-E 4 Q M //
WE 27. PPZWC NE-E 3-4 Q M //
ALGIER (37.5N 5.1E) SST: WT C
MO 25. QWZ: SE-S 2-3 PMT M //
MO 25. QIZ: SE 0-2 P M //
TU 26. PPZ: SE-S 2-3 PMT M //
TU 269 PYZ: N 0-2 PMT M //
TU 26. QWZ: NW-N 2-3 PMT M //
TU 26. QIZ: NE 3-4 Q M //
WE 27. PPZ:#N-NE 2-3 Q M //
GOLFE DU LION (42.2N 4.5E) SST: QO C
MO 25. QWZ: N 3 PMT M //
MO 25. QIZ: N 3 PMT M //
TU 26. PPZ: NW 2-3 PMT M //
TU 26. PYZ: NW-N 5 QMT M //
TU 26. QWZ: N 3-4 Q M //
TU 26. QIZ: N-NE 2-3 PMT M //
WE 27. PPZ: N-NE 0-2 PMT M //
BALARIC ISLANDS (39.2N 3.7E) SST: WR C
MO 25. QWZ: SW 4 PMT M //
MO 25. QIZ: SW 3-4 PMT M //
TU 26. PPZ: N-NE 4-5 PMT M //
TU 26. PYZ: NE 4-5 QMT M //
TU 26. QWZ: N-NE 4 Q M //
TU 26. QIZ: N 4 Q M //
WE 27. PPZ: N-NE 3 PMT M //
BALEARIC SW (38.6N 0.6E) SST: WR C
MO 25. QWZ: SW 4-5 Q M //
MO 25. QIZ: SW 4 Q M //
TU 26. PPZ: N-NE 3-4 PMT M //
TU 26. PYZ: NE-E 4 Q M //
TU 26. QWZ: NE-E 3 Q M //
TU 26. QIZ: E 3-4 Q M //
WE 27. PPZ: E-SE 2-3 Q M //
LIGURIAN SEA (43.3N 9.3E) SST: WP C
MO 25. QWZ: NE-E 0-2 PMT M //
MO 25.18Z: E 0-2 PMT M //
TU 26. PPZ: E 2-3 PMT M //
TU 26. PYZ: E 4 PMT M //
TU 26. QWZ: NE-E 3-4 PMT M //
TU 26. QIZ: N-NE 3 PMT M //
WE 27. PPZ: NE-E 3-4 PMT M //
W OF CORSE/SARD. KRQMRN 6.9E) SST: WQ C
MO 25. QWZ: SW-W 2-3 PMT M //
MO 25. QIZ: W 0-2 PMT M SH //
TU 26. PPZ: N 3-4 PMT M //
TU 26. PYZ: N 3-4 PMT M //
TU 26. QWZ: NE 3 PMT M //
TU 26. QIZ: NE-E 3-4 PMT M //
WE 27. PPZ: N-NE 3-4 Q M //
TYRRHENIAN SEA (41.5N 10.5E) SST: WW C
MO 25. QWZ: NW-N 0-2 PMT M //
MO 25. QIZ: N 0-2 PMT M //
TU 26. PPZ: NW-N 0-2 PMT M //
TU 26. PYZ: NE-E 0-2 PMT M //
TU 26. QWZ: E 2-3 PMT M //
TU 26. QIZ: NE 2-3 P M //
WE 27. PPZ: NE-E 2-3 PMT M //
S OF SICILY (35.9N 12.3E) SST: WY C
MO 25. QWZ: NW-N 3-4 Q M //
MO 25. QIZ: NW-N 3 Q M //
TU 26. PPZ: N 2-3 PMT M //
TU 26. PYZ: N 2-3 PMT M //
TU 26. QWZ: W 0-2 PMT M //
TU 26. QIZ: E 2-3 PMT M //
WE 27. PPZ: SE 2-3 PMT M //
into something meaningful that could be either plotted on the chart or used to generate a layer.

The whole thing sounds nice in theory, but FFS.
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Old 02-12-2021, 03:13   #15
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Posts: 179
Re: Navtex Plugin

Quote:
Originally Posted by stevead View Post
It's all ASCII text !

On a serious note, it would take a lot of programming effort and computing power to perform the natural language processing to geoparse something like:
Code:
SECURITE
FM JRCC AUSTRALIA 160429Z NOV 21
AUSCOAST WARNING 261/21
DRILL RIG OCEAN ONYX/V7EB9 IN POSITION 39-12.50S 142-52.48E
2.5 NM CLEARANCE REQUESTED.
NNNN
or
Code:
40:2:1:31:11:01:00
IDY10240
SECURITE

High Seas Forecast for Northern METAREA 8/10/11
NORTHERN AREA: EQUATOR TO 12S, 90E TO 142E AND SOUTHWARD TO COAST, 125E TO 142E

Issued by the Australian Government Bureau of Meteorology
For 24 hours commencing 2300 UTC 1 December 2021

Part 1 Warnings
TCWC Gale Warning for TC Teratai.

Part 2 Situation at 1800 UTC
Trough 06S090E 06S099E to Tropical Cyclone Teratai 997hPa near 09.9S101.9E,
forecast 04S090E 05S096E to Low 1002hPa near 9.5S100.2E at 030000UTC.

Part 3 Forecast
Refer to latest warnings.

Within 180nm of Tropical Cyclone/Low, outside warning area:
Clockwise winds 20/33 knots. Rough to very rough seas. Moderate swell.

Remainder:
Winds not exceeding 20 knots. Slight to moderate seas. Low swell, increasing to
low to moderate swell south of line 07S090E 05S098E 12S112E.

Scattered showers and isolated thunderstorms across much of the area.
Widespread showers and scattered thunderstorms within 240nm of Tropical
Cyclone/Low. Visibility reducing below 2nm in precipitation.

Please be aware
Wind and wave forecasts are averages. Wind gusts can be 40 per cent stronger
than the forecast, and stronger still in squalls and thunderstorms. Maximum
waves can be twice the forecast height.

WEATHER MELBOURNE

The next routine forecast will be issued at 07:15 UTC Thursday.
or
Code:
CQ CQ CQ DE DDK2 DDH7 DDK9
FREQUENCIES 4583 KHZ 7646 KHZ 10100.8 KHZ
RYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRYRY
ZCZC 535 
FQMM78 EDZW 250600
WEATHER AND SEA BULLETIN FOR WESTERN MEDITERRANEAN SEA
ISSUED BY MARINE WEATHER SERVICE HAMBURG
25.09.17, PP UTC:
GENERAL SYNOLTIC SITUATION:
LOW 1002 TAURUS, NEARLY UNCHANGED. THUNDERY LOW 1016
ADRIATIC SEA-IONIAN SEA, MOVING EAST A LITTLE. HIGH 11
WEST OF PORTUOZL TO 
OROWLGERIA, EASTERN PART MOVING
NORTH. IN THE REMAINING MEDITERRANEAN SEA ONLY SMALL
PRESSURE DIFFERENCES. WAVY ICELANDFRONTAL TROUGH 1018 BAY
OF BISCAY, WEAKENING, MOVING EAST.
DWD FORECAST OF MO/25/09.2017 PP UTC:
WIND FORCE: BEAUFORT, WVE HEIGHT: METRE
ABORAN (36.0N 2.3W) ST: WE C
MO 25. QWZ: SW-W 2-3 PMT M //
MO 25. QIZ: W 2-3 PMT M //
TU 2". PPZ: SW 2-3 PMT M //
TU 26. PYZ: SW-W 2-3 PMT M //
TU 26. QWZ: NZ-E 0-2 PMT M //
TU 26. QIZ: NE-E 2-3 PMT M //
WE 27. PPZ: NE-E 2-3 PMT M //
PALOS (37.0N 0.0E) SST: WR C
MO 25. QWZ: SW-W 4 PMT M //
MO 25. QIZ: SW-W 3-4 PMT M //
TU 26. PPZ: SW 3-4 PMT M //
TU 26. PYZ: W 0-2 PMT M //
TU 26. QWZ: S-SW 0-2 Q M //
TU 26. QIZ: NE-E 4 Q M //
WE 27. PPZWC NE-E 3-4 Q M //
ALGIER (37.5N 5.1E) SST: WT C
MO 25. QWZ: SE-S 2-3 PMT M //
MO 25. QIZ: SE 0-2 P M //
TU 26. PPZ: SE-S 2-3 PMT M //
TU 269 PYZ: N 0-2 PMT M //
TU 26. QWZ: NW-N 2-3 PMT M //
TU 26. QIZ: NE 3-4 Q M //
WE 27. PPZ:#N-NE 2-3 Q M //
GOLFE DU LION (42.2N 4.5E) SST: QO C
MO 25. QWZ: N 3 PMT M //
MO 25. QIZ: N 3 PMT M //
TU 26. PPZ: NW 2-3 PMT M //
TU 26. PYZ: NW-N 5 QMT M //
TU 26. QWZ: N 3-4 Q M //
TU 26. QIZ: N-NE 2-3 PMT M //
WE 27. PPZ: N-NE 0-2 PMT M //
BALARIC ISLANDS (39.2N 3.7E) SST: WR C
MO 25. QWZ: SW 4 PMT M //
MO 25. QIZ: SW 3-4 PMT M //
TU 26. PPZ: N-NE 4-5 PMT M //
TU 26. PYZ: NE 4-5 QMT M //
TU 26. QWZ: N-NE 4 Q M //
TU 26. QIZ: N 4 Q M //
WE 27. PPZ: N-NE 3 PMT M //
BALEARIC SW (38.6N 0.6E) SST: WR C
MO 25. QWZ: SW 4-5 Q M //
MO 25. QIZ: SW 4 Q M //
TU 26. PPZ: N-NE 3-4 PMT M //
TU 26. PYZ: NE-E 4 Q M //
TU 26. QWZ: NE-E 3 Q M //
TU 26. QIZ: E 3-4 Q M //
WE 27. PPZ: E-SE 2-3 Q M //
LIGURIAN SEA (43.3N 9.3E) SST: WP C
MO 25. QWZ: NE-E 0-2 PMT M //
MO 25.18Z: E 0-2 PMT M //
TU 26. PPZ: E 2-3 PMT M //
TU 26. PYZ: E 4 PMT M //
TU 26. QWZ: NE-E 3-4 PMT M //
TU 26. QIZ: N-NE 3 PMT M //
WE 27. PPZ: NE-E 3-4 PMT M //
W OF CORSE/SARD. KRQMRN 6.9E) SST: WQ C
MO 25. QWZ: SW-W 2-3 PMT M //
MO 25. QIZ: W 0-2 PMT M SH //
TU 26. PPZ: N 3-4 PMT M //
TU 26. PYZ: N 3-4 PMT M //
TU 26. QWZ: NE 3 PMT M //
TU 26. QIZ: NE-E 3-4 PMT M //
WE 27. PPZ: N-NE 3-4 Q M //
TYRRHENIAN SEA (41.5N 10.5E) SST: WW C
MO 25. QWZ: NW-N 0-2 PMT M //
MO 25. QIZ: N 0-2 PMT M //
TU 26. PPZ: NW-N 0-2 PMT M //
TU 26. PYZ: NE-E 0-2 PMT M //
TU 26. QWZ: E 2-3 PMT M //
TU 26. QIZ: NE 2-3 P M //
WE 27. PPZ: NE-E 2-3 PMT M //
S OF SICILY (35.9N 12.3E) SST: WY C
MO 25. QWZ: NW-N 3-4 Q M //
MO 25. QIZ: NW-N 3 Q M //
TU 26. PPZ: N 2-3 PMT M //
TU 26. PYZ: N 2-3 PMT M //
TU 26. QWZ: W 0-2 PMT M //
TU 26. QIZ: E 2-3 PMT M //
WE 27. PPZ: SE 2-3 PMT M //
into something meaningful that could be either plotted on the chart or used to generate a layer.

The whole thing sounds nice in theory, but FFS.


Bareboat Necessities OS (open source)
comes with another open source program called PC-NavTex.
So do not really need a plugin if you fine with using another program.
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