NorthStar 957 Operator's Manual page 14

Chapter 1 - Getting Started
Checking GPS and
WAAS status
Page 6
After the 957 displays its START-UP and SELF-TEST screens, a
message is shown to warn you against relying on the 957's
chart cartography as the only means of safe navigation.
Be extremely careful when navigating with electronic
charts. Although every effort has been made to ensure that the
data the 957 uses is as close as possible to paper charts,
errors and omissions are inevitable. The captain is responsible
for cross-checking the 957 against other sources of navigation
data.
To continue, accept the WARNING MESSAGE by pressing any
one of the five function keys (CHART, STAR, STEER, NAV
LOG, or WAYPTS/ROUTES) located below the display screen.
A 957 that has recently been used at or near that same loca-
tion will usually be ready to navigate within one minute.
Now you're ready to get underway with your 957!
Once the 957 is on and has acquired its satellite data, you can
always check the quality of the GPS signals by viewing the
various satellites' SNR reading (Signal-to-Noise Ratio) as
CAUTION!
957 Operator's Manual, Rev. B