Simrad EY500, Instruction Manual

Page: 67 / 262

Simrad EY 500
P3402/C
33
Bot. Range Pres. Options:
OFF
UPPER
BOTTOM
LOWER
While a normal echogram is referred to the surface, the
bottom echogram is always referred to the bottom. The
Bottom Range Presentation command allows you to
position this echogram at different places in the
echogram area. Bottom Range Presentation can be OFF,
positioned along the UPPER or LOWER boundary of the
echogram area, or positioned immediately below the
detected BOTTOM inside the echogram.
Sub. Bottom Gain Options:
0.0 to 5.0 dB/m in 0.1 dB/m steps.
This command may improve visual presentation of sub-
bottom echoes. When set to 0.5 dB/m an excess gain of
0.5 dB per meter below the detected bottom is added in
order to compensate for absorption in the bottom.
Presentation Options:
NORMAL
WH. LINE
CONTOUR
In NORMAL mode the echo signal is continuously
recorded as received by the transducer.
WHITE LINE presentation introduces a small gap in the
echogram below the detected bottom in order to improve
observation of targets close to the bottom.
CONTOUR presentation causes the echogram below the
detected bottom to be blanked out.