Yet another easily fixed bug: when writing KML files, gpsjinni produces only 4 digits after the decimal point for latitude, and only 3 for longitude. This gives a maximum accuracy of +/- 111 meters in longitude at the equator, and +/- 11 meters in latitude; both less precise than GPS is capable of.

The KML file should offer at least 6 digits after the decimal point for both coordinates. (Ideally, the inaccuracy field, which GPSjinni already calculates, would also be included in the KML.)