Hemisphere GPS MBX-4, User Manual

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3: MBX-4 Configuration and Operation
Position Fix Status (BX Mode Only) - When configured for BX
mode, the MBX-4 provides an indication of the GPS lock status, as
contained within the $GPGGA message string input from the external
GPS receiver. This indicator is located in the lower right hand corner of
the MBX-4 display. Figure 3-3, describes the three states of GPS lock.
Figure 3-3. BX-E Position Fix Indicator
In the first state, the two parallel vertical lines indicate that no position
fix is available. The second state, denoted by the hollow circle between
the two parallel vertical lines states that the receiver is tracking four
satellites or more, and is computing a position. This indicator is a
symbol representing a GPS satellite. The third state, denoted by the
solid circle between the two parallel vertical lines indicates that the GPS
receiver is computing differentially corrected position solutions.
No Fix GPS DGPS