A method for synchronization of an external device's clock 324 with a GPS
device 104 is provided. The method can comprise processing one or more
data sentences received at the external device 106 from the GPS device to
determine a data sentence containing the best available time information
that is most accurate among the data sentences. Also, an amount of
correction can be determined to compensate for one or more variable time
delays introduced by one or more processes. The one or more processes can
selected from a group consisting of a process performed by the GPS device
t.sub.1b, a data sentence transmission from the GPS device to the
external device t.sub.2b, and a data processing step performed by the
external device t.sub.3b. A synchronization time using the amount of
correction and the best available time information can be provided. The
method can further comprise correcting a timing error introduced into
time stamp values by the external device clock. This step can include
removing an accumulate error by restarting the method after a pre-defined
amount of time (e.g., one hour).