Furuno FR-1500 - Manual (Page 21)

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1.11 Presentation Modes
This radar has the following presentation modes: Head-up, Head-up/TB, Course-up, North-up, and
True Motion.
1.11.1 Selecting presentation mode
Press the [MODE] key on the panel at the right side of the display unit. Each time the [MODE] key
is pressed, the presentation mode and mode indication at the upper-left corner of the screen
change cyclically.
Note:
When a failure occurs in the gyrocompass, the radar will automatically be switched to
unstabilized presentation mode. All compass related data will read Relative values.
Loss of Gyrocompass signal
When the compass signal is lost, the presentation mode automatically becomes head-up and the
HDG (heading) readout at the top of the text area reads xxx.x°. Also GYRO SIGNAL MISSING
appears in red at the lower right corner on the screen. Press the MODE key, and the x’s go off.
Then, match the on-screen HDG readout with the heading value.