Deternining when GPS data is good

Hi!

I am new to GPS's and I am writing software application for the
PocketPC to get the location using I-Blue737 Bluetooth GPS. I can get
and parse the NMEA string okay and get the latitude and longitude
values, but I'm not sure when the location is within the 2D-RMS spec
of less than 3 meters. Can I assume after the cold start time, the
data is accurate? What do GPS applications typically do to determine
when the data is good? Any help would be appreciated!

Thanks a lot!!!
Anne

.

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