2-13
OPERATION KEYS
TARGET LOCK KEY
When pressing the Target Lock key in the Sonar Mode, the direction of sweep of the sonar
beam is reversed. (When MENU / TARGET LOCK / MODE 0 is selected.)
When pressing the Target Lock key in the Sonar Mode, the sonar beam tracks the echo
automatically. (When MENU / TARGET LOCK / MODE 1 or MODE 2 is selected.)
The red-letter
“TARGET LOCK” is displayed at the position of both “BEARING” and “SECTOR”
on the screen right.
•
Please refer to page 3-13 for more details of the Target Lock operation.
THRESHOLD KEY
The weak echoes disappear by pressing this key accordingly.
•
Only strong wanted targets appear on the screen by pressing this key to erase unwanted
returns such as plankton or noise.
•
Each press of Threshold key clears the weakest color sample.
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