Furuno FR-2105-B - Manual (Page 3)

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Before turning on the radar, make sure that there is no one near the
scanner unit.
Serious injury or even death may result if a rotating antenna strikes
someone standing nearby.
DANGER
SAFETY INSTRUCTIONS
WARNING
Radio Frequency Radiation Hazard
The radar antenna emits electromagnetic radio frequency (RF) energy which can be
harmful, particularly to your eyes. Never look directly into the antenna aperture from a
close distance while the radar is in operation or expose yourself to the transmitting
antenna at a close distance.