Hmm, this looks pretty interesting: http://www.landfallnavigation.com/sglf1.html
It's visible up to 32 km, runs up to 72 hours, and is waterproof up to 24 meters. I wonder what its specs are.
It's visible up to 32 km, runs up to 72 hours, and is waterproof up to 24 meters. I wonder what its specs are.