GPSMAP® 585 Plus 15search and judging the bottom conditions.Higher frequencies results in better resolutions, and are thus more useful fordetailed observations of fish echoes.Selecting Frequencies50 kHzThe fishfinder uses ultrasonic signals to detect bottom. The lower thefrequency, the wider and deeper the detection area. The 50 kHz frequency isuseful for general detection and judging the bottom condition.77 kHzThe 77 kHz is fishfinder’s mid-frequency with a wider beam angle fordetecting schools of fish at the bottom on the edges.200 kHzThe higher the frequency, the narrower the beam and the higher theresolution. The 200 kHz frequency is ideal for detailed observations.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 PresetNOTE: Not available with all transducers.You can create a preset to save a specific sonar frequency, which allows youto change frequencies quickly.1 From a sonar view, select MENU > Frequency.2 Select Add.3 Enter a frequency.
