Specifications

EQ33 Glossary of terms Appendix A-1
Alarms – can be set to sound a “beep” if the echosounder detects a target
above (shallower than) a minimum alarm depth or below (deeper than) a maxi-
mum alarm depth. The EQ33 allows you to set the alarm depths and to enable
or disable both the minimum and maximum depth alarms.
A-scope – a method of displaying the echosounder information. In A-Scope
mode, the echoes are displayed in a “bar-graph” format, with stronger echoes
displayed not only in the color representing their target strength, but also in a
width representing their target strength.
Color threshold – the color threshold function allows the “weaker” targets
and noise which may be shown on the display screen to be eliminated from
the display. These targets are usually shown in the weaker target colors such
as blues and greens. The Color threshold allows you to choose not to display
the blues, or the blues and greens, etc. Doing this will leave only the stronger
targets on the display screen.
Configuration – the configuration functions of the EQ33 allow you to adapt
the system more specifically to your needs. You may set Units of measure
(feet, fathoms, meters, etc.), Menu languages, Scroll speed, etc.
Depths – DK = Depth below keel, DS = Depth below surface, DT = Depth
below transducer.
Echogram background color – is the color shown on the EQ33 in the event
no target is present. There are three colors to choose from, white, blue or
black, where black is especially useful during nighttime operation when the
white background could appear too bright.
Echosounder frequency – 50 kHz or 200 kHz can be selected to suit the
task. 200 kHz is for general purpose and offers optimum discrimination and a
narrow transmitter beam. 50 kHz is for searching in a wider area, determining
bottom conditions and going the deepest.
Event marker – allows the user to set a vertical marker on the screen at the
current ping to indicate a school of fish, etc.
Expansion (zoom) – this function allows you to take a closer look at a par-
ticular section of the water underneath your boat. You can expand the view
near the bottom (Bottom expansion) or near the Variable Range Marker (VRM
expansion). The amount of expansion can be adjusted in “Expansion window”,
Presentation setup.
Gain – is another way of saying “sensitivity”, or possibly “volume”. Increas-