GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONS7.15 ACCU-FISH TMThe ACCU-FISH TM feature measures the length of individual fish and tags the fishwith a fish symbol whose size is scaled to the length of the fish. The length or depthof 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 isnot 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 transducer50/200-1T or 50/200-12M is recommended.• Echo intensity depends on fish species. When the fish length differs between theindicated 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 measured.• In a school of fish, echoes overlap one another, so the margin of error will be greater.• 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 causesa difference in both sensitivity and the echoes viewed.7-16