I have fix in 3-5 seconds (very fast) if I use VRTC, but this fix is nothing worth, as it is described it here: MC60 - problem with measurement accuracy of altitude in meters according to WGS84 ellipsoid - #2 by vincent.ding-Q Accuracy altitude, longitude or latitude : 50-200m (long. and lat.) and for altitude…no comment - from few hundred meters to over 1000m ! All recorded data, with longitude, latitude and altitude are too differ from each other (50-to over 1000m).