A radar reflector is a small
device fitted to small
ships etc. that helps the craft to show up on
radar scans. There are different types of radar reflector: some are just funny-shaped pieces of
metal, whereas others are similar in
design to
bike reflectors. Yet others act as
transponders and
amplify the
returning
signal.
In these days where most commercial vessels, and even some private boats, are fitted with radar to allow them to see through fog and storms, it is very sensible practice to have a radar reflector on your ship, so it can be seen when visibility is low.