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2.3 Terms Specific to Radar

HM (Heading Marker)

This is a line-shaped marker used to indicate

the advancing direction of your ship.

North Mark

This marker indicates the north direction. It is

a short line approximately 1/6 of the screen size.

Fig.2-9 Heading Marker and

North Mark

Display modes

This refers to a radar's display modes. There are four display modes depending on the direction in

which the top of the screen faces with respect to the ship.

Fig.2-10 Display modes

Head Up (HU)

In this mode, the ship's heading always indicates the upward direction of the screen. This

mode lets you know the relative positions of your ship and other ships or land.

North Up (NU)

In this mode, the north direction always indicates the upward direction of the screen, allowing

you to compare your ship’s position with a marine chart as you navigate.

Course Up (CU)

The ship's heading in a course-up mode always indicates the upward direction of the screen as

the bearing toward the destination. In this mode, the ship can be maneuvered to sail the shortest

distance to the destination by steering it in such a way that its heading marker always directs to

the upward direction of the screen. If the ship drifts due to tidal current, care must be taken be-

cause the fixed targets move to other positions.

True Motion (TM)

In this mode, the ship is displayed as if it is moving on a marine chart while the fixed targets

such as islands and seashores are fixed in position. When the ship reaches a certain position on the

screen (approx. 2/3 of screen size), the ship is placed back to the opposite side on the screen. (The

top of the screen faces north.)

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HM(Heading Marker)

North Mark

Ship's

Heading

North

Scheduled

course

EBL

North

mark

Ship's locus

(not displayed on screen)

North North

Scheduled

course

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