Garmin GPSMAP 2210 Bedienungsanleitung PDF herunterladen (Seite 81)

GPSMAP 2206/2210 Owner’s Manual 73

usIng sonAr > understAndIng sonAr

Understanding the Sonar Display

One of the rst things to understand about sonar is that the transducer sends a

beam down to the bottom of the water, much like the beam of a ashlight. The

beam starts small near your vessel and expands as it gets to the bottom.

The Sonar Page does not show a 3-D representation of the underwater

environment. Instead, the display is in two dimensions, much like if you took a

picture of an aquarium. Only the depth of the item in the water is shown.

The strongest sonar returns appear on your screen as the most intense solid

color (depending on your selected color scheme; red is the default). The weakest

returns appear as the less intense, less solid colors (blue is the default).

The bottom of the water will always be the strongest signal, and therefore the

most intense color. The bottom is the continuous, intensely-colored line running

across the bottom of the screen. The GPSMAP 2206/2210 uses the latest

technology in interpreting bottom signals; it can see through sh, structures, and

thermoclines (shown in the weakest colors). However, large schools of sh or

dense structures close to the bottom can affect water depth return readings.

NOTE: If the GPSMAP 2206/2210 is unable to track the bottom for any

reason, the digits in the depth window ash on and off to alert you that the unit

is not tracking the bottom.

At the top of the screen, you might see a grouping of intense colors. This area is

surface clutter, which can be caused by waves or any other sonar interference at

the surface of the water. Too much surface clutter can obscure your view of sh.

You can turn down the Gain setting to reduce this surface clutter.

Between the bottom and the surface clutter, the sh appear as arches. Actual

sh returns might not always appear as perfect arches, due to the speed, sh

orientation, or other conditions. You can turn on the Fish Symbols setting if you

want to see on-screen sh in a sh shape.

Fish Symbols Turned On

The strength of the sonar return can also help you interpret the hardness of the

bottom of the water (the thicker the bottom line, the harder the bottom).

Hard Structure Soft Structure

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Garmin GPSMAP 2210 Bedienungsanleitung Seite 81