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Gary,
If the aircraft is rather old (747-200 and a few others still flying
oceanic routes) they may not be equipped with CPDLC and so satellite
position reporting can not be done.  In the older aircraft it is still
done via HF and SELCAL.

As to the 777-200, I suspect it has CPDLC and more than likely Automatic
Dependent Surveillance version ADS-B or ADS-C.

Scott

On 3/17/2014 11:46 PM, Gary LaPook wrote:
> Radar is limited to the radar horizon, about 1.44 times the square root of 
the height of the antenna plus 1.44 times the height of the plane.  From 
35,000 feet the radar horizon is 230 nautical miles away. The radar detection 
range might be further limited by the power output of the radar transmitter 
based on the fourth power of the range, from the standard radar range 
formula. If the lane descended to 5,000 feet then the radar horizon was 
limited to about 90 NM. When I flew the ocean, separation of planes was based 
on HF position reports given by the pilots in this format:   
http://members.home.nl/7seas/radcalc.htm
>
>
> The standard format for position reports is:
>
> "Gander radio this is Cessna November one six two one seven;
> forty west, forty three thirty five north at 2015 ;
> flight level one zero zero;
> I-F-R;
> Estimating thirty five west, forty one twenty north at 2230 ;
> Mike next;
> Over."
>
> This is the same format over the U.S. if radar is inop.
>
> The
>   time
>   (Zulu of course) of the position is obviously an important element of
> the report and is the time at the position, not the time of the radio
> message which might be a bit latter depending on HF propagation
> conditions.
>
>
> As far as I know this is still done but the position reports are now sent 
over a satellite link instead of HF.
>
> gl
>
>
>
> ________________________________
>   From: Lu Abel 
> To: garylapook---.net
> Sent: Monday, March 17, 2014 1:51 PM
> Subject: [NavList] Re: Question for pilots.
>
>
>
>
> ________________________________
> There was a discussion of offshore tracking on one of the (US) national news 
programs yesterday and when asked about a knowledgeable hijacker disabling 
satellite tracking (as the MN370 hijackers apparently did with their ground 
transponder), the aviation expert being interviewed said "unfortunately, 
there's always a circuit breaker somewhere that someone with sufficient 
expertise could throw ..."
>
>
>
>> ________________________________
>> From: Richard B. Langley 
>> To: luabel{at}ymail.com
>> Sent:
>> Subject: [NavList] Re: Question for pilots.
>>
>>
>>
>>
>> ________________________________
>>
>> In the future, we might not have to rely on radar. NAV CANADA has entered 
into a joint venture with Iridium Communications, called Aireon, which will 
expand air traffic surveillance to the entire planet by installing ADS-B 
receivers on Low Earth Orbit (LEO) satellites. The plan is to use the Iridium 
NEXT satellites. I guess such a system could also be turned off on an 
aircraft unless it is made tamper-proof. But it would likely have a circuit 
breaker somewhere.
>>
>>
> : http://fer3.com/arc/m2.aspx?i=127243
>
> : http://fer3.com/arc/m2.aspx?i=127250
>
>
>

   

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