There is a much larger choice of strobes these days. Some are much larger than the previous models of a decade ago. The newer models can have C batteries and much larger Xenon flash bulbs that have a much higher output that can be seen for miles above water.



The below strobe is interesting in that it doubles as a back up light, or torch as they say in the U.K.



Check around, these newer, more versatile and powerful strobes are all over the Internet.