Chris, my Sony returns coordinates that are within the error estimate of my other GPS.
GPS: xx 43 40.100 S, xxx 59 31.200 E 117 m Above Sea Level (in my study)
A77: xx 43' 39.70" S, xxx 59' 30.60" E 116.8 m Above Sea Level (in the back yard ~20m W and ~5m N from the study)
It does take a minute or so to report position after turning on (less if you have not moved far) and helps flatten the camera battery, but does set the camera clock.
I have a GPS logger but this is much more convenient.
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