Description: This is the GPS� receiver health status defined as
follows:
======================================================
0 = Receiver Down       The Hardware Clock can't 
                        communicate with the receiver.

1 = No Signal

2 = Acquiring Signal    The receiver is tracking a GPS 
                        signal.

3 = 2d Position mode    The receiver is able to perform 
                        position fixes for latitude and 
                        longitude but does not have 
                        enough satellites for altitude.

4 = 3d Position mode    The receiver is now able to 
                        perform position fixes for 
                        latitude, longitude and altitude.

5 = Position Hold mode  Position fixes are no longer 
                        attempted, and the user entered 
                        or surveyed position is used.

6 = Time Valid mode     The receiver has valid timing 
                        information from GPS satellites 
                        (including current leap second 
                        information).  This is the final 
                        state for all configured GPS modes.
======================================================