GE MDS Mercury 900, Reference Manual

Page: 125 / 211

116 Mercury Reference Manual 05-4446A01, Rev. E
GPS Status Menu
Invisible place holder
Figure 3-88. GPS Status Menu
• GPS Serial Number —The serial number of the GPS unit in the
radio.
• GPS Firmware Version —The firmware version running on the
GPS chip.
• Satellite Fix Status —Indicates whether or not the unit has
achieved signal lock with the minimum required number of
GPS satellites. The transceiver requires a fix on five satellites to
achieve Precise Positioning Service (PPS) and four to maintain
PPS. [
No Fix, Fix ]
• Number of Satellites —Shows the number of GPS satellites
received by the transceiver. Although there are typically 24
active GPS satellites orbiting the Earth twice a day, only a sub-
set of these is “visible” to a receiver at a given location. A good
signal provides information from six to ten satellites.
• Latitude —Shows the transceiver’s latitudinal location (in
degrees), based on GPS data received from the satellites.
• Longitude —Shows the transceiver’s longitudinal location (in
degrees), based on GPS data received from the satellites.
• Altitude —Shows the transceiver’s altitude above sea level (in
feet), based on GPS data received from the satellites.
• GPS Information —Shows data about the individual satellites
being received, including the Pseudo-Random Noise (PRN)
code (a unique bit stream for each satellite), the satellite’s ele-
vation (in degrees), azimuth (in degrees), and the sig-
nal-to-noise ratio of the carrier signal (SNR).
Figure 3-89 on
Page 117 shows a layout example for this screen.