Furuno fi-304 Instruction De Maintenance

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4.3 
Main function
Top 
data is COMPASS HEADING.
Top
 data is either magnetic or true HEADING and your choice
is set in the set-up. When magnetic Compass course is
selected, the small MAG sign is lit on the LCD.
4.4 
Analogue function
Press  the  PAGE  button to change from Compass heading to
steer reference. The LCD arrow will then point at the text
STEER
 instead of  HEADING.
HDC 360
°° 
The text  HDC 360° means true or magnetic
course for the LCD pointer in a 360° scale
STR 60
°°
The text STR 60° means that the course deviation
is amplified 3 times and displayed in a 60° scale.
At 360° scale, each sector represent 5° and at 60° scale each
sector represent 1 
2
/
3
°.
Three sectors in steer mode
represents 2° error
Each sector in Compass mode
represents 5°