Furuno SC-120 manual Choosing heading source, Adjusting antenna orientation, Heading setup menu

2. INSTALLATION

When the system is turned on for the first time it is in the “cold start” state, which means there is no satellite data (almanac data) stored. In this condition it takes about 20 minutes to find heading, indicated by displaying “OK.” (Once almanac data is stored it takes about five minutes to find heading.) The timer at the top left corner of the screen shows time since power on. If OK is not displayed within 30 minutes after turning on the power, the antenna mounting location may not be

suitable. It is suspected that the number of		Antenna BOW
satellites in view is less than five due to
		Element
signal blockage. Clear the problem and
	- Direction	2
then check status on the status display.
	Antenna
If the heading error is between 5° and 10°,	Element	+ Direction
	3
loosen the nut at the center of the antenna	PORT
unit and adjust antenna orientation, while
watching the heading indication on the
display.		Antenna
		Element

1

Adjusting antenna orientation

2.6.2Choosing heading source

Choose the source of heading data as below:

CAUTION

1.Never switch from internal to external heading while the autopilot is in the automatic mode. Change to the manual mode before switching.

2.The data of external heading must come from type-approved sensor, in case of SOLAS vessel.

1.Press the [HDG SETUP] key.

HEADING SETUP

OFFSET : +000.0

(SERVICE ONLY)

HEADING : INT

INT HDG	- - - . - ￿
EXT HDG	- - - . -￿

OFFSET : Heading offset. See service manual for instructions. "SERVICE ONLY" means heading offset shown for display only.

HEADING : Select heading source. Choose INT for normal use. If a gyrocomapss is connected for primary means, leaving this equipment as backup, choose EXT.

INT HDG : Bow heading. Includes offset.

EXT HDG : Heading fed from external equipment.

Heading setup menu

2.Use the Omnipad to choose HEADING.

3.Press the [ENT] key.

4.Choose INT or EXT as appropriate. Normally choose INT. If the GPS sensor is not working and a heading sensor such as a gyrocompass is available, choose EXT.

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