Furuno GP-1971F - Fish Finder Display Settings; ACCU-FISH

6. FISH FINDER
6-9
6.16 Fish Finder Display Settings
Display settings for the fish finder can be changed from the [Settings] => [Fish Finder]
menu. Referring to the list below, changed the settings as required.
• [Palettes] => [Day Palette]/[Night Palette]: Set the color scheme to use for Day/
Night palettes.
• [Display] => [Echo Colors]: Set the number of colors available when an echo ap-
pears on the screen.
• [Display] => [Color Bar]: Show/hide the color bar.
6.17 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 compatible with ACCU-FISH
TM
is required.
6.17.1 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 526TID-HDD is recommended.
• Echo intensity depends on fish species and can cause a difference between the in-
dicated length and the actual length. When the indicated fish length differs from the
actual length, you can compensate for the difference on the [Fish Finder] menu in
the [Home] => [Settings] menu.
• When ACCU-FISH
TM
is active, the auto range feature is automatically turned on.
• ACCU-FISH
TM
is not available with CHIRP transducers.
• 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.
• This feature cannot be used with the inside-hull transducer since a fish may not be
detected depending on the transducer's frequency. Even if a fish is detected, the
fish length indicated may be smaller than actual length.