Raymarine Ray 106 User's Guide download pdf (Page 99)

Chapter 11: Using the Radar (HD and SuperHD Digital) 89

11.4 Radar window overview

Your position

By default your boat is shown at the center of the radar display and your

dead-ahead bearing is indicated by a vertical line known as the Ship’s

Heading Marker (SHM).

Operation modes

The radar gives excellent results in one of the four pre configured operation

modes under the Gain softkey. Select the mode that best suits your

circumstances attempting to make manual adjustments to the settings

could degrade your image. (However, this facility is available.) See page 93

for more information.

Other vessels or objects

On-screen targets may be large, small, bright or faint, depending on the

size of the object, its orientation and surface type.

Remember that the strength of an object’s echo may not be proportional to

the physical size of the object. For example, a nearby object might produce

an echo of the same strength as a more distant, but larger object.

With experience, the approximate size of different objects can be deter-

mined by the relative size and brightness of the echoes.

Factors affecting echo strength

• The physical size of the reflecting object.

• The material from which the object is made. Metallic surfaces

reflect signals better than non-metallic.

• Vertical surfaces, like cliffs, reflect the radar signal better than

sloping surfaces, like sandbanks.

• High coastlines and mountainous coastal regions can be observed

at longer radar ranges. Therefore, the first sight of land may be a

mountain several miles inland from the coastline. Although the

coastline may be much nearer, it may not appear on the radar until

the vessel is closer to shore.

• Some targets, such as buoys and small boats, can be difficult to

discern, because they do not present a consistent reflecting surface

as they bob about in the waves. Consequently, these echoes tend

to behave erratically on the radar screen.

• Buoys and small boats often resemble each other, but boats can

often be distinguished by their motion.

• Trees and shrubbery’s do not reflect radar. Thus, they can disguise

the shape of nearby land.

D10778_1

Ships

heading

marker

Land mass

Data bar

Ships

position

Range ring

Range

ring

seperation

Motion

mode

Orientation

Radar

range

Auto

Settings

Pathfinder

panel

Orientation

Mode

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Raymarine Ray 106 User's Guide Page 99

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