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Boat skipper suspended after boat sank in collision when iPad navigation app failed

A British man at the helm of a 50-foot boat doesn't realize how unreliable Wi-Fi signals can be. His boat is struck by a huge cargo ship.

A fascinating accident report just released by the UK's Marine Accident Investigation Branch.

Collision between Petunia Seaways and Peggotty on the River Humber
UK Crash Report:


dumpvdl2 is a lightweight, standalone VDL Mode 2 message decoder and protocol analyzer.


    Runs under Linux (tested on: x86, x86-64, Raspberry Pi)
    Supports following SDR hardware:
        RTLSDR (via rtl-sdr library)
        Mirics SDR, eg. SDRPlay (via libmirisdr-4)
        reads prerecorded IQ data from file
    Decodes up to 8 VDL2 channels simultaneously
    Outputs messages to standard output or to a file (with optional daily or hourly file rotation)
    Outputs ACARS messages to PlanePlotter over UDP/IP socket
    Supports message filtering by type or direction (uplink, downlink)
    Outputs decoding statistics using Etsy StatsD protocol

Supported protocols

    AVLC - supported
    ACARS over AVLC - supported
    ISO 8208 (X.25) control packets - supported
    ISO 8473 (CLNP) - partially supported (CLNP header is skipped over without decoding)
    ISO 9542 (ES-IS) - supported
    ISO 10747 (IDRP) - partially supported (decoding of some less important attributes is TODO)
    ICAO ULCS - not supported
    ICAO Applications (CM, CPDLC) - not supported

Integration with Planeplotter

dumpvdl2 can send ACARS messages to Planeplotter, which in turn can extract aircraft position information from them and display blips on the map.

Frequently Asked Questions
What is VDL Mode 2?

VDL (VHF Data Link) Mode 2 is a communication protocol between aircraft and a network of ground stations. It has a higher capacity than ACARS and a lot more applications. More information can be found on Wikipedia or SigIdWiki.
Who uses it?

Civil airlines - not all, but many. Military? Umm, no.
What frequencies it runs on?

The most ubiquitous is 136.975 MHz (so called Common Signalling Channel). In some areas where the capacity of a single channel is not enough, 136.725 or 136.875 is used as well. Because they are closely spaced, dumpvdl2 can receive all of them simultaneously with a single RTLSDR receiver.
Is it used in my area?

If you are in EU or US, that's quite probable. Launch your favorite SDR Console (like SDRSharp or GQRX), tune 136.975 MHz and place your antenna outside (or near the window, at least). If you can see short bursts every now and then, it's there.
What antenna shall I use?

VDL2 runs on VHF airband, so if you already have an antenna for receiving ACARS or airband voice, it will be perfect for VDL2. However VDL2 transmissions are not very powerful, so do not expect thousands of messages per hour, if your antenna is located indoors. If you have already played with ADS-B, you know, what to do - put it outside and high with unobstructed sky view, use short and good quality feeder cable.
Heads Up / military spotted
« Last post by blackwolf1 on February 27, 2017, 01:16:33 PM »
3 chinooks and 2 pumas flew over wigan this morning????????
Airnav Radarbox / Re: Silhouettes
« Last post by Leclere on February 27, 2017, 01:05:39 PM »
Airnav Radarbox / Re: Silhouettes
« Last post by Leclere on February 27, 2017, 01:04:54 PM »
Airnav Radarbox / Re: Logos
« Last post by Leclere on February 25, 2017, 07:35:00 PM »
T7-GOB, Triton Aviation
G-HAAT, Hertfordshire Air Ambulance
N616RK, Tenax Aerospace
Aviation News / Aireon Gets into Initial Space-Based ADS-B Testing
« Last post by Brian on February 25, 2017, 12:42:47 AM »
Aviation News / New Dime Sized ADS-B for High Traffic Density Drone Operations
« Last post by Brian on February 25, 2017, 12:40:03 AM »
RealADSB What's New in Version 1.24 ADSB Aircraft Software - Released Feb 19, 2017.

What's New in Version 1.24
* Support for new types of military aircrafts
* New icon for fighters: F15, TOR, ...
Antennas & Connectors / Re: Looking for a good DIY 1090MHz Antenna, any suggestions?
« Last post by Keith D on February 24, 2017, 10:07:24 PM »
Hi all,

I'm looking for a good DIY 1090MHz Antenna, any suggestions?

here you go

excellent antenna

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