Davis 151 Emergency Radar Reflector
Effective in any weather and every small boat needs a radar reflector in fog or reduced visibility.
The Davis Emergency Radar Reflector is a compact, lightweight and economical unit that disassembles and stows flat for storage.
When needed, it pops open to 11.5" Diameter (29 cm) and installs in seconds.
Its three perpendicular planes reflect radar from all directions.
Davis Emergency Radar Reflector Manual