Eagle Electronics FISHEASY 240 - Manual (Page 64)

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Fish ID menu and symbol with FishTrack on. The fish is 44 feet deep.
FishReveal 
When displaying actual sonar returns, the FishReveal  feature helps
show fish targets hidden by surface clutter, thermoclines, weed beds
and other cover with 10 levels of gray tones.
Normal operation (with FishReveal turned off) shows the weakest ech-
oes as black and the strongest in light gray. Since all weak echoes are
black, fish arches show boldly against the white background. The
drawback is that all weak echoes — such as thermoclines — are also
accentuated. This can make it hard to distinguish fish signals inside
thermoclines or other cover.
Fish I.D. symbol
showing FishTrack
depth indicator