On July 31, 2007, the FAA will decommission WAAS satellites 122 and 134,
leaving satellites 135 and 138 for WAAS differential corrections in North
America. In order to continue receiving WAAS differential corrections
after the July 31, 2007cutoff date, receivers must have updated WAAS
firmware loaded onto their systems or have satellites 135 and 138
manually selected through a terminal communication program. Customers
should check with their GPS manufacturer to see if firmware updates are