Operator's Manual

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 paragraph 13.5.4 "System-

DFF1/BBDS1/DFF1-UHD, -DFF3/FCV Menu". For External KP, see paragraph 13.5.5

"System-ETR-6/10N Menu".