英文關鍵字
antenna
beacon
blue
coastal
communication
control
defense
detecting
detection
detector
direction
equipment
finder
fleet
harbor
lighthouse
locator
maritime
military
monitoring
nautical
navigational
navy
observation
outdoors
place
position
protection
radar
radio
radiodetector
radiolocator
receiving
recon
safety
scout
security
sensor
sky
sonar
supervision
system
technology
tower
tracing
tracking
warning
weather
white