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2.8 STC
This is useful to clear the surface of unwanted echoes to look for surface fish. The setting
range is 0-10, and 0 is Off. In setting 10, STC deletes unwanted echoes from the surface to
about 5m. Avoid setting the STC too high; fish echoes near the surface may be erased.
2.9 gain offset
If you want to increase or decrease the sensitivity or to control the sensitivity balance between
low frequency and high frequency, you can set offset value. If sensitivity setting value is so
small, weak signal is suppressed, then there’s no image. If the values is so big, it will be
difficult to identify the images because of noise. So you should control the gain.
Setting for low frequency STC
select [display]
select [STC(low)]
select desired value
Setting for high frequency STC
select [display]
select [STC(high)]
select desired value
Setting for low frequency gain offset
select [display]
select [gain offset(L)]
select desired value
Setting for high frequency gain offset
select [display]
select [gain offset(H)]
select desired value
