NorthStar 490 Echosounder Operation Manual page 71

490 Echo Sounder Operations Manual Rev. B2
490 Features and Specifications
Table 4: 490 echo sounder features
Performance characteristics
490-S
490-D
Alarms
Update rate
Auto modes
Zoom modes
Features
Single Channel, 50/200kHz, 600W
Dual Channel, 50/200, 1kW
Fish, seabed, temperature
10 Hz maximum (depends on water depth)
Fishing and cruising
Marker, bottom, bottom lock, bottom lock/center
Mark present or past echo as waypoint (961/962)
Go directly to any past echo
A-scope analyzes present or past echoes
Navigation data shown at bottom of screen
Demo mode for training
Page A-1