Abstract: A method of determining a GPS position fix. The method includes: (i) sampling received GPS signals and storing those samples; (ii) conducting preliminary processing of those GPS signal samples to determine the likelihood of being able to obtain a position fix during later, final processing of those GPS signal samples; and (iii) after step (ii), conducting final processing of those GPS signal samples to obtain a position fix.

Abstract: A method of determining a location of an event of interest by processing signals from a satellite positioning system. The method comprises receiving recorded blocks of data samples of a satellite broadcast including blocks recorded at the approximate location of the event of interest, each block including one or more timestamps generated within a first portable device at which the samples were recorded; receiving a time of occurrence of the event recorded independently of the samples; comparing the timestamps and the time of occurrence to identify at least one block corresponding to the event; and processing the data samples of the identified at least one block to derive position information approximating the location of the event.

Abstract: A method of appending a position stamp to an image file of a photo or video clip taken with a digital camera having a GPS antenna and a GPS RF front-end including an analogue to digital converter for receiving GPS signals and outputting GPS signal samples together with a digital camera and computer for the same.

Abstract: A method of generating a map display for a graphical user interface (GUI) comprising the steps of displaying a map, highlighting a first area on the map surrounding a first position fix wherein the size of the area corresponds to the accuracy of the first position fix and highlighting a second area on the map surrounding a second position fix wherein the size of the second area corresponds to the accuracy of the second position fix. Either (a) when the first and second areas overlap, either (i) the one corresponding to the most recent or accurate position fix is displayed on top of the other or (ii) the highlighting of the overlapping area is different from that of those parts of the first and second areas which do not overlap, or (b) the manner in which at least one of the position fixes is obtained is indicated by the color of the highlight. The area highlighted on the map surrounding the position fix may be a shape other than a circle.