The Federal Aviation Administration (FAA) recently
decommissioned two WAAS GPS satellites and
activated two replacement satellites. This means
the WAAS firmware in certain older and some current
model GPS receivers are no longer able to receive
WAAS correction signals.

There are a number of ways to determine if your GPS
receiver is receiving signals from the new satellites.

If your GPS unit has a satellite status page, which
most do, check to see if it is receiving data from
satellite #51 on the east coast and/or satellite #48
on the west coast.

If you are not receiving the data, you will need to
either upgrade the firmware in your present GPS,
change some settings or replace it entirely to obtain
the improved accuracy provided by WAAS corrections.