position as used in this specification an u201c estimated satellite position u201d means any data relating to the position of a satellite such as a coordinate in a coordinate system advantages of certain embodiments of the present invention include the relatively small file size such that network bandwidth is saved at download time furthermore the small file size makes use of the extended ephemerides better in assisted gps situations for example through the supl standard proper weighting of the least squares fit for correction parameters will decrease the likelihood of a large error during the first few days of the extended ephemeris data validity period it should also be noted that the correction term does not need to be computed with a very accurate time an accuracy of several seconds is sufficient this is due to the smoothness of the correction terms which in turn is due to the good overall prediction made by the almanac which is adjusted to be correct in average for over one week one particular embodiment of the invention involves a method of calculating a position comprising using a corrected almanac model to calculate the position of at least one satellite and using signals received from the at least one satellite with the position of the at.