Radar Reflector
Every boat needs a radar reflector to make it more visible to ships in low-visibility conditions. Davis reflectors are constructed of radar-reflecting material in three perpendicular planes that reflect radar from all directions.
The Davis No. 151 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" (29cm) diameter and installs in seconds. It's great for small boats or to pack for emergencies.