[aprssig] YOTREPS and AIS

Scott Miller scott at opentrac.org
Thu Jul 31 12:24:50 EDT 2008

Ok, good to know.  Maybe one of these days we'll have enough APRS 
satellites that it'll be practical to do this on VHF...


Dave Skolnick wrote:
>> Date: Wed, 30 Jul 2008 10:11:37 -0700
>> From: Scott Miller
>> I've been looking at ship tracking data here...
>> http://www.sailwx.info/shiptrack/shiplocations.phtml
>> And I was surprised to see a bunch of ham callsigns in there as well.
>> If you filter it to show only yachts, they're the majority.  Apparently
>> they're using something called YOTREPS over HF email.  I'd heard that
>> Winlink can carry position data, but this is a new one to me.
>> Seems like HF APRS would be a more efficient way to send position
>> reports than sending text files through Winlink, but apparently it
>> works.  Does anyone know any more about this system?
> Winlink position reports end up in the findu database. YOTREPS is just
> another database. Airmail supports dual position reporting that feeds
> into both findu and YOTREPS with a single message. YOTREPS is also fed
> by manual entry from marine SSB voice nets. There are several display
> applications on the web that draw from one or the other or both of
> findu and YOTREPS, including shiptrak.org.
> For a sailing vessel with power conservation concerns there is a lot
> of appeal to a system like PACTOR that acknowledges receipt. You may
> not always get through but you know for sure if you did. A commercial
> ship or motoryacht could afford to run an HF APRS transmitter all the
> time with some statistical assurance of getting through, but that is
> impractical on most sailing boats.
> sail fast, dave / KO4MI
> S/V Auspicious
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