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SECTION THREE — Installing the 491
PAGE 20 491 INSTALLATION MANUAL Revision A
For the 957/958/6000i
You must set the navigator’s AUX port to “Sounder”:
1. Press the STAR key to display the OPTIONS/SERVICE INFO screen,
then press the PORT SETUP OPTIONS key.
2. Set the AUX PORT option to Sounder, then press the ENTER key.
The STATUS indicator light on the 491 glows steady green when the 491’s
power is on and it is communicating with the navigator.
Setting up the echo
sounder
You’ll need to set the echo sounder display options on the navigator’s
ECHO SOUNDER SETUP screen. Press the STAR key to display this screen
and set these options. For details, see the Northstar 491 Echo Sounder
Operations Manual (GM494).
Turning the 491 off
To turn off the 491, turn off the navigator by pressing and holding PWR
until the screen goes dark. The 491 will turn off automatically.
Installation
test checklist
1. Make sure the vessel is in the water.
2. To test the system after installation, turn on the navigator and con-
firm that power is on with no errors. If echo sounder data isn’t mov-
ing across the ECHO screen from right to left, see ”Common 491
installation problems” beginning on page 21.
CAUTION!
If the vessel is out of the water when the echo
sounder is turned on, the transducer may be dam-
aged. Perform all tests on the with the vessel in the
water.