On Thu, 08 May 2014 13:04:39 -0700, mattmckrell wrote:

Typically varios send one sentence a second containing the lift data and
some other stuff.

Some (mainly older ones?) like the SDI C4 don't send anything - they just
receive GPRMB,GPRMC,GPROO,GPWPL - the set needed to calculate wind and
final glide. Presumably 'other stuff' includes IAS.

Sentences indicating things that don't change that
often (MC, ballast, bugs, whatever) are sent less frequently, or only
when those values change.

Makes sense. How big are the sentences? Are their formats generally
available?

FLARM data volume depends on the connection
speed. At 19.2K it sends a pretty large amount of data describing all
the targets in view. At slower speeds you just get the warnings.

I'd heard that, but have seen any documentation of either those messages
or the FLARM additions to their IGC log files. IIRC both message sets are
regarded as proprietary/undocumented.


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martin@ | Martin Gregorie
gregorie. | Essex, UK
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