Raymarine E SERIES Installation Instructions Manual page 76

Note: Due to physical size and other constraints
that vary from vessel to vessel, it may not
be possible to completely eliminate crosstalk
interference from your system. However, this
will not impede your ability to benefit from the
full capabilities of your sonar system. Being able
to easily identify the way in which interference
is displayed in the Fishfinder application can
sometimes be the best and easiest route to dealing
with it.
76 a Series / c Series / e Series installation instructions