Table of Contents
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Index
PAGE 32
overview
11
safety considerations
troubleshooting
wiring
14
transducer
cautions
3, 5, 19
cavitation
5
hull thickness limits
noise problems
preferred mounting location
recommended incline angle
thru-hull installation with a fairing block
M
Maintenance, transducer
N
Northstar
feedback on manuals
website. See Website addresses
Northstar 491 Echo Sounder. See Echo sounder
Northstar 957/958 GPS/WAAS Chart Navigator
Northstar 957/958/6000i GPS/WAAS Chart Navigator
Northstar 961/962 GPS Chart Navigator
P
Parts, ordering. See Technical support
S
Safety considerations
491
11
transducer
3
Software upgrades, obtaining
Specifications
27
STAT (status) indicator light
T
Technical support
contacting Northstar
ordering parts
25
repairing the 491
25
repairing the transducer
Transducer
definition of
29
installation. See Installation, transducer
maintenance. See Maintenance, transducer
mounting. See Installation, transducer
recommended
4
service, parts and repair
Troubleshooting
diagnostics screen
flow chart
23
installation checklist
installation problems
11
21
6
5
5
8
8
25
1
18
18
24
25
25
21
19
21
491 INSTALLATION MANUAL Revision A
8
18
1
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