Section Five: Checking Out The System; Turning The 972 On And Off; Chart Data; Checking Satellite Status - NorthStar 972 Installation Manual

SECTION FIVE: Checking out the system

Turning the 972 on and off

To turn on the 972, gently and briefly press the PWR key. The unit emits several short beeps as it
displays the screen, then performs a series of self-tests to check its critical components and
start-up
functions. Next, a message is shown reminding against relying on the 972's chart cartography as the
only means of safe navigation. To turn the unit off, press and hold the PWR key for several seconds,
until it turns off.
Important: Wait at least 10 seconds before turning the system back on to allow all voltages to decay.

Chart data

The 972 is shipped with all chart data preprogrammed in the processor. Charts are unlocked for
access as needed (see the Northstar 972 QuickStart Guide and Reference Manual (P/N GM972UM).

Checking satellite status

To see information about signals from the satellites, press POSITION and then Sat Info.
The satellite map on the
The 972 displays GPS satellites as circles; WAAS satellites as ovals. You can check the quality of their
signals by looking at each satellite's Signal-to-Noise Ratio (SNR). The higher the ratio, the better the
quality.
972 Installation Manual, Rev. B
screen shows the current location of the satellites in the sky.
GPS satellites
Figure 9: Satellites on the GPS satellites screen
WAAS
satellite
number
GPS
satellite
number
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