I have to retract it. Apparently when it is retuning or changing sets of satellites it can skip a fix (or two). This is not necessarily wrong - if it hasn't computed the coordinates. I could try 4Hz but want to see. It seems that when it has a good and consistent lock (not me blocking alternate halves of the sky every few seconds) I get the full 10 samples.

This probably works for Bluetooth as well, but I can't get some of the "private" detail sentences which would help determine why some of the points are missing.