NorthStar 972, Руководство по установке

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972 Installation Manual, Rev. B Page 21
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
start-up
screen, then performs a series of self-tests to check its critical components and
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
GPS satellites
screen shows the current location of the satellites in the sky.
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.
GPS
satellite
number
WAAS
satellite
number
Figure 9: Satellites on the GPS satellites screen