Frequency (Seacharter Only) - Eagle FishElite 640c Installation And Operation Instructions Manual

To turn on FishTrack:
NOTE:
These steps turn on FishTrack and Fish I.D. at the same time.
1. From the Sonar Page, press |↓ to | .
MENU S F ENT
ONAR EATURES
2. Press → ↓ to
| | | .
F D ENT EXIT EXIT
ISH EPTHS
To turn off FishTrack, repeat the instructions in step 1. Turning off
FishTrack in this manner will not turn off Fish I.D. symbols.
Fish Symbols
with FishTrack
depths
Sonar Features menu with Fish ID Depths selected (left). Sonar Page
showing Fish I.D. symbols and FishTrack depths turned on (right).

Frequency (SeaCharter only)

The SeaCharter 640cDF transducer operates with both 200 kHz and 50
kHz. The 200 kHz frequency has a 12° cone angle and the 50 kHz fre-
quency has a 35° cone angle.
The default frequency is 200 kHz, best for use in shallow water (about
300 feet or less). This frequency is the best choice for about 80 percent
of the fresh and salt water sport fishing applications. When you get into
deep salt water — 300 to 500 feet or deeper — the 50 kHz frequency
will perform better.
The 200 kHz transducer will give you better detail and definition, but
less depth penetration. The 50 kHz transducer will give you greater
depth penetration, but a little less detail and less definition.
Remember: all sonar units typically read deeper in fresh water than in
salt water.
There is a common exception to these rules. Some fishermen on fresh-
water lakes (or the ocean) using downriggers like to see them on the
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