Garmin GPSMAP 3010C User Manual download pdf (Page 91)

GPSMAP 3006C/3010C Owner’s Manual 83

usIng sonar > sonar tab

sonar

General Sub Tab

Use the General sub tab to select the water type, depth number, automatic scroll

speed limit, scale, keel offset, and transducer type. The available General sub tab

options are as follows:

•

Auto Gain—controls the aggressiveness of the Auto Gain when the Gain

option is set to Auto. The higher the setting, the greater the number of

targets appear on the screen. The lower the setting, the less clutter on the

screen. The settings are Low, Medium (default), and High.

• Auto Color Gain—controls what colors are applied to the objects on the

screen when the Color Gain option is set to Auto. Color DCG™ is based

on depth and makes it easier to spot subtle changes in bottom conditions

or sh sizes. DynaColor™ (default) represents the latest in sonar data

presentation and is recommended for all applications. The presentation is

based on bottom strength. It makes the bottom and the sh easier to see and

requires fewer adjustments.

• Automatic Scroll Speed Limit

—automatically adjusts the scroll rate with

the speed of your vessel. Entering your maximum cruising speed produces

a 100% scroll rate when you reach that speed. One half of that speed

produces a 50% scroll rate, and so on. The default is 30.0 kt.

• Keel Offset

—allows you to offset the surface reading for the depth of a

keel. This makes it possible to measure depth from the bottom of your keel

instead of from a transducer’s location near the water line. Enter a positive

number to offset for a keel. You can also enter a negative number to

compensate for a large vessel that may draw several feet of water, requiring

the transducer to be submerged if you want to measure from the water line.

The Keel Offset is reected in the depth reading.

Transducer at surface.

Enter (+) a positive

number to show depth

from bottom of keel.

Transducer at bottom of keel.

Enter (-) a negative number to

show depth from surface.

• Transducer Type—allows you to specify what type of transducer you are

using, either Dual Beam or Dual Frequency.

•

Calibrate Water Speed—this is available only if you are using a

speed-capable transducer/sensor. Calibration is required to ensure that the

Water Speed shown on your unit is accurate. The unit automatically uses

the GPS ground speed, if it is available, for comparison on the calibration.

If a GPS ground speed is not available, use either your boat’s speedometer

reading (not always accurate) or a stopwatch to determine your speed over

a certain distance (distance / time = speed). It is recommended that you

calibrate in water having little or no current.

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Garmin GPSMAP 3010C User Manual Page 91

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