I think the standard for marine radars on oil installations around here (norsok) was to be able to detect a large steel target at 25 nm. It is now 8 years sinc

I think the standard for marine radars on oil installations around here (norsok) was to be able to detect a large steel target at 25 nm. It is now 8 years since I worked with it last time and 1000m2 sounds very large to me but that is the only number that pops into my head. So yes, if you are in a small boat, use a radar reflector and also be alert.