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7. FISH FINDER OPERATIONS
7-16
7.15 ACCU-FISH
TM
The ACCU-FISH
TM
feature measures the length of individual fish and tags the fish
with a fish symbol whose size is scaled to the length of the fish. The length or depth
of the fish can be indicated digitally. Connection to a transducer that supports ACCU-
FISH
TM
is required.
7.15.1 Considerations for ACCU-FISH
TM
• The fish length calculated by this fish finder is intended for reference purposes; it is
not a completely accurate measurement of fish length.
• The 600 W transducers which support ACCU-FISH
TM
are 520-5PSD, 520-5MSD,
525-5PWD, 525STID-MSD and 525STID-PWD.
• To display fish marks and fish size using a 1 kW transducer, the integrated trans-
ducer 50/200-1T or 50/200-12M is recommended.
• Echo intensity depends on fish species. When the fish length differs between the
indicated length and the actual length, you can compensate the difference on the
[FISH FINDER] menu.
• ACCU-FISH
TM
is inoperative when the zero line rejector is active.
• High and low frequencies are alternately transmitted when ACCU-FISH
TM
is active,
regardless of mode selection.
• A fish whose depth is shallower than 2 m or greater than 100 m cannot be mea-
sured.
• In a school of fish, echoes overlap one another, so the margin of error will be great-
er.
• The bottom echo must be present to show the fish symbols.
• The TX pulse length changes according to ACCU-FISH
TM
On/Off state. This caus-
es a difference in both sensitivity and the echoes viewed.