Sar Aircraft?

[Frank]

Sometimes there is an unknown aircraft (to me at least!)flying around  my vicinity. It only transmits AIS positions, no Mode-S or ADS-B signals. Because I use the 3D Radarbox software and the Shipplotter .kml the aircraft is visible on my Radarbox map. To my knowledge it is a Sar-aircraft, but I am not sure about that...

Question: why does this aircraft only transmits AIS signals and no Mode-S/ADS-B signals?

Link:

http://intcsa.blu.livefilestore.com/y1p4oM_i_NNUs6LkjlmVeQCOhyGjqSq8lXehVZPr6eN3q71Uog_bDNRasVQDJgW9fJ9YCblSq5vTLwzbrJ_l9W6zBJe3va3f1Bt/mmsi%20000002021.JPG

Thanks, Frank

[tarbat]

In ShipPlotter, what vessel class/type is it listed as?

http://www.shipais.com/showship.php?map=Friesland&mmsi=2021 has it listed as a type 14 - Reserved Haz D, so not listed as a SAR aircraft.

Of course, many aircraft don't have ModeS fitted :(

[jannuh]

Telling by speed and type I would say it's a SAR aircraft.

Have them overhere (S.E. Netherlands) on regular basis on AIS / Shipplotter.
WMV file from 2 years ago:
http://83.161.210.231/middenlimburg/downloads/audio-video/sar-ais.wmv

Screenshot from Shipplotter to GoogleMaps output:


Btw, never seen SAR on my RadarBox Mylog.

[Frank]

According to Shipplotter it is listed as Res Sar Ac (P). So that made me think it could be a Sar Aircraft. Pity it is one of the many aircrafts not sending any mode-s signal...

[Frank]

Jannuh,
 Thanks for the movie. Never logged a Sar in Mylog Radarbox too. The Coastguard Dorniers are regular guests though,

Frank

[Frank]

I have spotted this one today again , now transmitting both mode-s and AIS. It is an Augusta AW139 Police Helicopter s/n 31267 Registration PH-PXY, using ZXP25 as Callsign/Flight Id

Frank

[jannuh]

Hi,

Exactly this one is regular guest overhere, its mmsi in SP is xxxxx(leading zeros)2024

The regular Police Heli's (EC35) from RB's mylog feb & march:

13:40:39 
   484A91  ZXP01                    PH-PXA  ...   Politie (Korps La... 2010/03/10
12:09:46 
   484A96                           PH-PXF  ...   Politie (Korps La... 2010/03/05
05:57:16 
   484A91  ZXP01                    PH-PXA  ...   Politie (Korps La... 2010/02/24
12:49:51 
   484AC0  ZXP26                    PH-PXZ  ...   Politie Luchtvaar... 2010/02/09
17:46:30 
   484A96  ZP06                     PH-PXF  ...   Politie (Korps La... 2010/02/04
16:41:57 
   484A96  ZP06                     PH-PXF        Politie (Korps La... 2010/02/03

[tarbat]

If you're interested in tracking SAR helicopters, then ShipTrax is very good for this.  G-SARB currently tracking in my area:


http://www.flickr.com/photos/tarbat/7240595146/sizes/o/in/photostream/