[Xastir] Re: [Gpsd-dev] SiRF GPRMC bug? and GPGGA format

[Derrick J Brashear]

On Mon, 16 May 2005, Eric S. Raymond wrote:

> Derrick J Brashear <shadow at dementia.org>:
>> So, 1) GPRMC specified 07.4f, which means a total field width of 7,
>> padded at left with zeroes, and 4 digits to the right of the .
>
> Is this really true?  I thought the field width didn't count the decimal point.

main(){
   double f = 83.55678;
   double g = 100.5;
   double h = 5.23;
   printf("%08.4f %08.4f %08.4f\n", f, g, h);
   printf("%07.4f %07.4f %07.4f\n", f, g, h);
}

083.5568 100.5000 005.2300
83.5568 100.5000 05.2300

If you zero pad 5, then you zero pad 83. 07.4f is never right. It's either 
06.4f or 08.4f.

>> 2) GPGGA should have the same padding applied.
>
> Um...why?  Does NMEA require it?

Seems like real receivers have it. What does NMEA require? Nailing it down 
seems hard. You're already zero padding in one place. Why not here?