13. How to Adjust Settings
13-20
13.5.6 System-ETR-30N Menu
Stc HF (LF): Delete unnecessary echoes (plankton, air bubbles, etc.) near the sur-
face. Use this feature to clear the surface of unnecessary echoes to look for surface
fish. The setting range is 0-10, and 0 is Off. “10” deletes unnecessary echoes from the
surface to approximately 16 ft. If the echoes near the surface are erased completely,
decrease the Stc.
Frequency Adjust HF (LF): You can adjust the TX frequency of both the low- and
high-frequency transducers. Use this feature when your fish finder and another fish
finder operate on the same frequency, causing interference. Change the frequency of
your transducer by enough percentage points to remove the interference.
Target Echo Set your fishing purpose, [Normal] or [Surface]. Select [Surface] when
your purpose is to find the fish near the surface.
For [Transmission], [Gain Adjust], [Bottom Level], see "13.5.4 System-DFF/FCV
Menu" on page 13-17. For External KP, see "13.5.5 System-ETR-6/10N Menu" on
page 13-18.
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