The Innovation column has appeared in GPS World magazine continuously since the first issue of January/February 1990. The early columns are difficult to find except for those who were fortunate to have had inaugural subscriptions to the magazine. Black and white reprints of the first 15 columns have been scanned into PDF files and are available for download here. Note that there have been many improvements to GPS technology over the intervening years and the information in these early columns must be taken in context. In some cases, corrections and updated information has been supplied as attached comments.