Originally Posted by MastUndSchotbruch
I agree with your conclusion that active radar plus AIS is best. If this is not in the cards, and neither is a $4000.- passive reflector, then these reports, in agreement with the Practical Sailor study that I cited, all agree that the Trilens is the best solution.
Correct 70% average of 25% of minimum needed return makes it the least worthless of the completely worthless and still adds nothing to your safety with large shipping. But It should help the 30 ft fishing boats out there from hitting you.
Practical Sailor is using a 2.5 sq. meter as a minimum.
ISO uses 7.5 and UK government uses 10 sq meters and warns that that will really not be seen.
Your boating safety dollar is wasted on these products and a $25 dollar model will keep you in regs.