Onwa Marine Electronics KS-200A - Manual (Page 15)

Mast(Pole)
INSTALLTION WITH CLAMPS
Antenna
Clamps
Antenna Cable
Connector
4. Installation of GPS Antenna
11
The GPS antenna is mounted in an elevated position and free of shadow
effect from the ship's superstructure.
The GPS antenna has a free view through 360 degrees with a vertical
angle of 5 to 90 degrees above the horizon.
As the received GPS signal is very sensitive to noise and interference
generated by other onboard transmitters, ensure that the GNSS antenna
is placed as far away as possible from radar, Inmarsat and Iridium
transmitters and ensure the GPS antenna is free from direct view of the
radar and the Inmarsat beam.
It is also important that the MF/HF and other VHF transmitter antennas
are kept as far away as possible from the GNSS antenna. It is good
practice never to install a GNSS antenna within a radius of 2 meters from
these antennas.