491 Sounder / Fishfinder is a discontinued product
Northstar 491 Sounder/Fishfinder
DISPLAY
| Display Type |
6100i or 6000i Compatible (Also 972, 962, 961, 958, 957)
|
| Split Screen Presentation |
Yes
|
SONAR / SOUNDER
| Sonar Frequency |
50 kHz or 200
kHz
|
| Transducer Type |
Various: See transducer selection table
|
| Sonar Output Power |
Max
600W or 1000
W
|
| Sonar Depth |
Max
3500
ft
\ 1077
m
|
| Sonar Alarms: Fish, Max and Min Depth |
Yes
|
| Depth Alarm |
Yes
|
| Shallow Alarm |
Yes
|
| Temperature Display |
Yes
|
| Depth Units |
Yes
|
| Sonar Max Transmission Rate |
600
|
| Sounder On/Off |
Yes
|
AUTOPILOT / AUTOSTEERING
POWER
| Power Supply |
10-36 VDC, 8 watts. Reverse polarity and overvoltage protected
vDC
|
OTHER
| Adjustable Gain |
Yes
|
| Alarm Output |
Yes
|
| Dedicated Mode Keys |
Yes
|
| Environmental Rating |
Waterproof, Sealed Design
|
| Gain |
0-75 dB
|
| Lat/Long Display |
Yes
|
| Manual Automatic Control |
Yes
|
| Other Features |
-
”SoundTrac” go directly to past echo
-
Navigation data shown at bottom of screen
|
| Sea Temperature |
Yes
|
| Speed Units |
Yes
|
| Type Of Equipment |
Blackbox Sounder
|
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