32
Rev 20201007
Map Cartridge Notifications:
When this is selected, and you have
your Navionics® chip inserted it will notify you when your chips
subscription expires.
Battery Voltage Power down:
This menu feature allows you to
select at what voltage your systems will shut down at to maximize or
minimize your runtime.
INTERPRETING SIGNALS
DIGITAL DEPTH
The digital depth display on the MarCum MX-7GPS provides a quick
and easy way to determine depth. Digital Depth is always displayed
in the center of the circular display, and on the bottom of the vertical
displays. It will also show in the upper left corner of the chart in
some configurations. This display can be used as a quick reference
when checking depths through the ice or in a boat.
READING BOTTOM
When interpreting your bottom signal, always read the leading edge
(shallowest side) of the signal return. If you have a strong signal
return (wide band) and it starts at 13 feet and ends at 16 feet, the
correct depth is 13 feet or the shallowest leading edge of the return
signal. Anything beyond the shallowest leading edge indicates the
strength of the return signal.
The MarCum MX-7GPS can also be used to determine bottom
composition. The thicker and bolder your bottom shows, the harder
the bottom is. In some cases, hard bottom can be indicated by a
“double” or second echo that will show on your display at
approximately twice the water depth. Soft bottom (silt, mud, muck)
will only register one bottom reading.
Using your Sonar in conjunction with an underwater viewing system
is a great way to learn how to interpret your sonar signals.