103
Reference section 7 — Echo sounding
Welcome to the Northstar Echo Sounder
Reference Manual Revision B
Welcome to the Northstar Echo Sounder
How echo sounding works
An echo sounder produces high-voltage
electrical pulses (called “pings”) that the
transducer converts into sound waves.
When a sound wave hits and reflects off an
object, such as fish, debris, seaweed, or the
seabed, the reflected sound wave (an
“echo”) returns back to the transducer
along an imaginary vertical line called a
“water column.” The transducer converts
this echo into a tiny electrical pulse. The
sounder digitizes these pulses and sends
them to the navigator, so that echo
sounding pictures of the water and seabed
can be displayed and analyzed on the echo
sounder screen. The echo sounding system
lets you see a real-time cross section of
what’s happening underneath your vessel.
The 491 module automatically turns on
and off as the 972 is turned on and off.
There is a 20-second delay after the 972
turns off before the 491 turns off.
Setting up the sounder
Your sounder should be installed by a quali-
fied marine technician. Your satisfaction
with the system’s performance will be greatly
influenced by the practical knowledge and
experience of the installer. Unlike GPS or
other marine electronics systems, echo
sounder installation is as much an art as it
is a science.
The installation procedure includes setting
the 972’s AUX port to the sounder option,
and then setting the following options.
Once properly set, they should not be
adjusted further.
•
the transducer’s depth
•
the speed and temperature
•
the calibration for the speed sensor
•
the calibration for the temperature
sensor
•
the gain calibration for the transducer
CAUTION!
Proper installation and configuration of
your Northstar sounder is of utmost
importance for accurate and effective
performance under a variety of
conditions. To get the best performance,
Northstar strongly recommends
installation and set-up be performed by a
qualified marine technician. For
installation procedures, see the Northstar
Echo Sounder Installation Manual (Part
Number GM491).
Содержание 972
Страница 1: ...Northstar 972 Quickstart Guide and Reference Manual Revision B ...
Страница 12: ...8 Getting Started Purchasing charts Northstar 972 ...
Страница 19: ...15 Displaying the chart screen Quickstart Guide Revision B Chart screen ...
Страница 30: ...26 SAVE and Man Overboard MOB Northstar 972 ...
Страница 44: ...40 Reference section 1 Using the Chart Screen Using the distance and bearing calculator Northstar 972 ...
Страница 54: ...50 Reference section 3 Position coordinates Using Phantom Loran Northstar 972 ...
Страница 88: ...84 Reference section 5 Creating waypoints and routes Transferring waypoints to and from a PC Northstar 972 ...
Страница 90: ...86 Reference section 6 Radar Transferring waypoints to and from a PC Northstar 972 ...
Страница 106: ...102 Reference section 7 Echo sounding MARPA targets Northstar 972 ...
Страница 130: ...126 Reference section 7 Echo sounding Troubleshooting the echo sounder Northstar 972 ...
Страница 131: ...127 Reference Manual Revision B Reference section 8 Video Video sources 128 Displaying video 128 ...
Страница 134: ...130 Reference section 8 Video Displaying video Northstar 972 ...
Страница 135: ...131 Reference Manual Revision B Reference section 9 Alarms and TideTrack Alarms 132 TideTrack 137 ...
Страница 145: ...141 Reference Manual Revision B Reference section 10 Networking General information 142 Restrictions 142 ...
Страница 148: ...144 Reference section 10 Networking Restrictions Northstar 972 ...
Страница 158: ...154 Reference section 11 Setup Changing the time zone Northstar 972 ...
Страница 164: ...160 Reference section 11 Appendix A Datum list Changing the time zone Northstar 972 ...
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