Index
overview 11
safety considerations 11 troubleshooting 21 wiring 14
transducer cautions 3, 5, 19
cavitation 5
hull thickness limits 6 noise problems 5
preferred mounting location 5 recommended incline angle 8
M
Maintenance, transducer 8
N
Northstar
feedback on manuals 25 website. See Website addresses
Northstar 491 Echo Sounder. See Echo sounder Northstar 957/958 GPS/WAAS Chart Navigator 18 Northstar 957/958/6000i GPS/WAAS Chart Navigator 1 Northstar 961/962 GPS Chart Navigator 1
P
Parts, ordering. See Technical support
S
Safety considerations
49111
transducer 3
Software upgrades, obtaining 18 Specifications 27
STAT (status) indicator light 18
T
Technical support contacting Northstar 24 ordering parts 25 repairing the 491 25 repairing the transducer 25
Transducer definition of 29
installation. See Installation, transducer maintenance. See Maintenance, transducer mounting. See Installation, transducer recommended 4
service, parts and repair 25 Troubleshooting
diagnostics screen 21 flow chart 23 installation checklist 19 installation problems 21
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