8 | Introduction to the Navico radar system
Caution: International Regulations for Preventing Collisions at Sea mandate indicate
that when radar is on a vessel, the radar must be used at all times, regardless of
weather conditions or visibility. Numerous court decisions have not only ruled the
radar must be used, but that the radar operator must be knowledgeable in all
operational aspects of radar performance; or otherwise face a greater risk of liability
if an accident occurs.
WARNING: High Voltage Hazard
There is dangerously high voltage present within the radar scanner unit. Technicians
must exercise extreme care when working inside the unit. ALWAYS remove power
before removing the cover. Some capacitors may take several minutes to discharge,
even after switching off the radar. Before touching the magnetron or any high voltage
components, ground them with a clip lead.
WARNING: Microwave Radiation Hazard
The microwave energy radiated by a radar antenna is harmful to humans, especially
to the eyes. NEVER look directly into an open waveguide or into the path of radiation
from an enclosed antenna. Radar and other radio frequency radiation can upset
cardiac pacemakers.
If someone with a cardiac pacemaker suspects abnormal operation, immediately turn
off the radar equipment and move the person away from the antenna. Turn off the
radar whenever it is necessary to work on the antenna unit or other equipment in the
beam of the radar.
Note: Most countries accept that RF power density levels below 100 W/m² cause no significant
RF hazard.
Scanner
Model
Vertical beam
angle of scanner
(degrees)
Minimum safe distance
(100 Watts per m² average
power density) Note 1
Minimum safe distance
(10 Watts per m² average
power density) Note 2
2 kW 30 1.6 ft (0.5 m) 4.6 ft (1.4 m)
4 kW 25 3 ft (0.9 m) 9.3 ft (2.8 m)
Note: Limits apply to exposure within the vertical beam angle.
Note 1: Peak occupational exposure limit pursuant to IEC 60936 Clause 3.27 and IEC 62252
Clause 4.32
Note 2: General public exposure limit pursuant to IEC 60936 Clause 3.27 and IEC 62252 Clause
4.32
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