I am using QSTARZ 818XT device for my app. I am using GPGGA sentences to get the GPS fixes, but I have noticed that timings are always rounded like xxxxxx.000 - for 1Hz GPS frequency and xxxxxx.x00 for 10 Hz GPS frequency.
Why is this happening? Is that something device specific? Can I trust these timings or should I make some corrections? My app does not function in real time, but it really needs those milliseconds.