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Corrected precision figure for lat/long values. Added derivation and

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an example.
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U-ATSAUVS\heath.raftery 2016-08-09 08:44:37 +10:00
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@ -40,7 +40,9 @@ to either fixed-point or floating-point format:
The compound type ``struct minmea_float`` uses ``int_least32_t`` internally. Therefore, The compound type ``struct minmea_float`` uses ``int_least32_t`` internally. Therefore,
the coordinate precision is guaranteed to be at least ``[+-]DDDMM.MMMMM`` (five decimal digits) the coordinate precision is guaranteed to be at least ``[+-]DDDMM.MMMMM`` (five decimal digits)
or ±20cm LSB at the equator. or ±2cm LSB at the equator. Note that GPS modules commonly only provide four deciminal digits
(``[+-]DDDMM.MMMM``), which equates to ±20cm (0.0001 minute is 0.0001/60 degrees and one degree
is about 111km) at the equator.
## Coordinate format ## Coordinate format