Selecting Frequencies; Creating A Frequency Preset - Garmin GPSmap 585 Plus Owner's Manual

search and judging the bottom conditions.
Higher frequencies results in better resolutions, and are thus more useful for
detailed observations of fish echoes.

Selecting Frequencies

50 kHz
The fishfinder uses ultrasonic signals to detect bottom. The lower the
frequency, the wider and deeper the detection area. The 50 kHz frequency is
useful for general detection and judging the bottom condition.
77 kHz
The 77 kHz is fishfinder's mid-frequency with a wider beam angle for
detecting schools of fish at the bottom on the edges.
200 kHz
The higher the frequency, the narrower the beam and the higher the
resolution. The 200 kHz frequency is ideal for detailed observations.
GPSMAP 585 Plus
®
NOTE: You cannot adjust the frequency for all sonar views and transducers.
You can indicate which frequencies appear on the sonar screen.
1 From a sonar view, select MENU > Frequency.
2 Select a frequency suited to your needs and water depth.

Creating a Frequency Preset

NOTE: Not available with all transducers.
You can create a preset to save a specific sonar frequency, which allows you
to change frequencies quickly.
1 From a sonar view, select MENU > Frequency.
2 Select Add.
3 Enter a frequency.
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