What is a radar reflector?
A radar reflector is an electronic device used to reflect radar waves. Radar reflectors help to make boats, ships, or other watercraft clearly visible on radar screens, which helps to aid navigation on waterways and bodies of water
A radar reflector is something you put high up on your mast that reflects radar waves, making you more visible to radar. This makes it considerably less likely that you’ll be mowed down by a ship you never see. (There have been a number of heartbreaking incidents of that type, so don’t think you’re immune or this is mere fantasy; those ships are out there lurking). Get one and use it, even if you have radar. Fortunately, it’s very cheap (I think around $ 30).