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Page 68 491 Echo Sounder Operations Manual
Screen notations
Echo data
Seabed depth (various size digits)
Frequency of each window
Speed through water (if connected)
Water temperature (if connected)
Depth scale for each window
Depth of depth marker
Latitude/longitude of position marker and vessel
Alarm status and auto/manual status
Zoom mode
Name of waypoint, and distance and bearing to
waypoint
Steering indicator
Interfacing
Connects Northstar 961/962 GPS Chart Navigator
Northstar 957/958/6000i GPS Chart Navigator
Northstar-recommended or compatible transducer
Other Transducer outputs protected against open circuit/
short circuit
LED monitors input power and system status
Physical characteristics
Dimensions 8.78 x 7.22 x 2.35 inches
Weight 2 pounds
Environmental characteristics
Temperature -25ºC to +60ºC operating temperature
-55ºC to +90ºC storage temperature
Protection 8 to 36 VDC, 8 Watts, reverse polarity and over-
voltage protection
Standards Waterproof design meets the following: IEC60529
IP6; IEC60945 emissions; CE mark
Table 4: 491 echo sounder features (Continued)