Furuno FR-7062, FR-7252 Selecting the Presentation Mode, Erasing the Heading Marker, North Marker

2.11Selecting the Presentation Mode

This radar provides four presentation modes: head-up, course-up, north-up and true motion.

Press the [MODE] key.

With heading sensor connection, the display and the display mode indication at the top left-hand corner of the display change in the sequence of HU RM (Head-up), CU RM (Course-up), NU RM (North-up) and NU TM (True Motion) when the [MODE] key is pressed. If there is no heading sensor connection, the display mode is always HU RM.

Note: The radar begins operation with last selected display mode (except Course- up) whenever the unit is turned on. Note however that Head-up is selected when Course-up was the last-used mode.

Head-up

The picture is oriented so the heading marker is at the top of the display. This mode is useful for navigation in congested waters.

Course-up

The Course-up mode shows ship’s heading by the heading marker, at the top of the display. To get heading desired, steer vessel in direction de- sired, and then show “CU RM” at the top left- hand corner of the display.

North-up

North is at the top of the display and the head- ing marker moves with ship’s heading. This mode is useful for determining ship’s position and as a navigation monitor on a nautical chart. The picture is stabilized against yaw of vessel, thereby reducing smear of target echoes. Bear- ing signal is required from a heading sensor.

True motion

True motion displays own ship and moving objects in their true motion. Bearing signal and speed signal are required from heading sensor and speed sensor.

2.12Erasing the Heading Marker, North Marker

The heading marker or north marker (available with gyrocompass connection) may occasion-

ally mask a target. To view the target, you can temporarily erase the heading marker and north marker by pressing and holding down the [GAIN (HM OFF)] control. Release the con- trol to re-display the markers.

Heading marker

North marker

Figure 2-6 Heading marker and north marker

2.13Magnifying Long Range Echoes (echo stretch)

Normally, the reflected echoes from long range targets appear on the display as weaker and smaller blips even though they are compensated by the radar’s internal circuitry. The echo stretch function magnifies these small blips in all ranges. Two types of echo stretch are available: ES1 which stretches echoes in bearing direc- tion and ES2 which stretches them in both range and bearing directions.

To turn the echo stretch on or off, press the [A/C RAIN (ES)] control. Each press changes the echo stretch function in the sequence of ES1, ES2 and OFF. ES1 or ES2 appears at the top right-hand corner of display when echo stretch is on.

Bearing	Bearing
direction	direction

Range direction

Echo stretch 1 Echo stretch 2

Figure 2-7 Echo stretch

Note1:This function magnifies not only targets but also sea clutter and radar interference. For this reason be sure the controls for adjustment of sea clutter and radar interference are properly adjusted before activating the echo stretch.

Note 2: ES2 is not available on short ranges.

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