Hello,
        One vendor we starts nimea strings with BD and GN instead of GP ie 
$GPGGA,blab, blab becomes $BDGGA,blab and $GNGGA,blab

If all systems are selected and the receiver has enough of each system you can 
have up to three $*GGA messages per update.

Link  
On Dec 5, 2014, at 3:32 PM, Iain Young <[email protected]> wrote:

> On 05/12/14 22:40, Bob Camp wrote:
> 
>> Typically they let you selectively enable each of the major systems. As you 
>> enable more systems, you get more sat’s in each of the messages. For most 
>> users, there is not a lot of reason to enable multiple systems. If you want 
>> UTC sync’d to USNO you enable one system. If you want to set your watch to 
>> time from Moscow, you enable another system …. Setting your watch to both is 
>> impractical.
> 
> Time-nuts will buy multiple, enable one major system on each, and
> compare, and draw ADEV plots!
> 
> 
> Iain
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