Raytheon NSC 18 User Manual page 16

A short exposure to the microwaves radiated by the radar antenna is harmless.
However, avoid prolonged exposure to the microwaves. Never look directly into the wave
guide while checking transceiver operation, since microwaves are especially harmful to the
eyes.
The radiation of microwaves can be checked with a neon tubel . The neon tube will glow in
the presence of microwaves.
Edition: 14.JAN.2005
NSC 18
RADAR
Operator Manual
MICROWAVE RADIATION
1−3
R
Raytheon Marine GmbH
Germany
3748DOC020102