120
Reference section 7 — Echo sounding
Viewing past echoes using SoundTrac
Northstar 972
Press this key again to cycle through the
available sizes: small, medium, large, and
huge.
Press the cursor pad up and down to set
the position of the box along the left edge
of the screen.
Press the cursor pad up and down to set
the position of the box along the left edge
of the screen.
Viewing past echoes using SoundTrac
On the
SoundTrac
screen, you can use
Northstar’s exclusive SoundTrac feature to
look back and examine past echo data.
To enable SoundTrac:
1. At the main
Echo Sounder
screen, press the
cursor pad to the left.
The position marker — a dashed vertical
line — is now displayed.
2. To move back to echoes that were displayed
within the past few minutes, continue pressing
and holding the cursor pad to the left.
The 972 recalls echoes from the last 3000
pings.
As you move the position marker with the
cursor pad, the marker speed accelerates
to quickly scroll to the desired location.
The lat/lon of the position marker is
displayed at the bottom of the picture,
along with the time elapsed since the ping,
and the distance and bearing from your
present position to the marker (assuming
the navigator is providing position data).
As you move the position marker left and
right, these coordinates change
accordingly.
NOTE:
When you use the position marker on a split
screen (showing either two frequencies, or
zoom mode), each half of the screen has a
position marker. Both markers designate the
same physical location.
The number of minutes of past echo data
available depends on two factors:
•
the depth of the water
•
the advance speed
In deeper water, the sounder pings at a
slower rate, so the echo sounder saves data
over a longer period of time. A slower
advance speed will have the same effect.
s
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Summary of Contents for 972
Page 1: ...Northstar 972 Quickstart Guide and Reference Manual Revision B ...
Page 12: ...8 Getting Started Purchasing charts Northstar 972 ...
Page 19: ...15 Displaying the chart screen Quickstart Guide Revision B Chart screen ...
Page 30: ...26 SAVE and Man Overboard MOB Northstar 972 ...
Page 54: ...50 Reference section 3 Position coordinates Using Phantom Loran Northstar 972 ...
Page 90: ...86 Reference section 6 Radar Transferring waypoints to and from a PC Northstar 972 ...
Page 106: ...102 Reference section 7 Echo sounding MARPA targets Northstar 972 ...
Page 130: ...126 Reference section 7 Echo sounding Troubleshooting the echo sounder Northstar 972 ...
Page 134: ...130 Reference section 8 Video Displaying video Northstar 972 ...
Page 148: ...144 Reference section 10 Networking Restrictions Northstar 972 ...
Page 158: ...154 Reference section 11 Setup Changing the time zone Northstar 972 ...
Page 164: ...160 Reference section 11 Appendix A Datum list Changing the time zone Northstar 972 ...
Page 168: ...164 Northstar 972 Notes ...
Page 169: ...Notes 165 Operator s Manual Revision B ...
Page 170: ...166 Northstar 972 Notes ...
Page 171: ...Notes 167 Operator s Manual Revision B ...
Page 172: ...168 Northstar 972 Notes ...
Page 173: ...Notes 169 Operator s Manual Revision B ...
Page 174: ...170 Northstar 972 Notes ...
Page 175: ...Notes 171 Operator s Manual Revision B ...
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Page 177: ...Notes 173 Operator s Manual Revision B ...
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Page 179: ...Notes 175 Operator s Manual Revision B ...
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Page 181: ...Notes 177 Operator s Manual Revision B ...
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