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Simrad SN90
Selecting Replay mode ...........................................................................................56
Selecting Inactive mode .........................................................................................57
Setting up the SN90 for maximum echo refresh rate .............................................58
Transmitting single pings .......................................................................................59
Transmitting with fixed-time intervals ...................................................................59
Adjusting the output power to match varying conditions ......................................60
Selecting the best operating frequency...................................................................61
Controlling the gain and range settings ...........................................................................63
Adjusting the gain (echo sensitivity)......................................................................63
Adjusting the TVG (Time Variable Gain) setting ..................................................65
Adjusting the sonar range.......................................................................................65
Adjusting the intensity of the echo presentations...................................................67
Changing the tilt .....................................................................................................67
Adjusting the bearing .............................................................................................69
Using the markers and tracking features..........................................................................71
Starting a position track..........................................................................................71
Starting a target track..............................................................................................72
Placing a new marker .............................................................................................73
Deleting a marker ...................................................................................................74
Measuring the size of a school relative to the purse seine .....................................75
Using visual aids during the purse seine catch phase.............................................75
Choosing the fishing gear in use.............................................................................77
Changing the fishing gear properties to match your own equipment.....................78
Improving the recognition of fish and schools using receiver filters ...............................79
About the receiver filter sequence in the SN90 ......................................................79
function ..............................................................................................................80
Reducing propeller noise and interference with the Noise Filter ...........................81
Controlled Gain) function..................................................................................82
Reducing noise and false echoes with the Ping-Ping Filter ...................................84
function ..............................................................................................................85
Adjusting the intensity of the echo presentations...................................................86
Recording and replaying echo data..................................................................................87
Defining the file and folder settings for data recording..........................................87
Recording echo data ...............................................................................................88
Selecting Replay mode ...........................................................................................89
Choosing which echo data file(s) to replay ............................................................90
Accessing the echo data files to delete, move or copy them ..................................91
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381295/B
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