LOST AND FOUND

Even the best-rigged dive boat can’t help you if you lose your way underwater or are swept away by current. When the unthinkable happens and you surface to an empty blue ocean, you need emergency signaling gear. To be seen and heard, the pros from ScubaLa

Nautilus Marine Rescue GPS

ScubaLab’s Testers’ Choice winner, this waterproof Nautilus

GPS broadcasts a digital man-overboard signal with GPS coordinates to any boat within 34 miles equipped with an AIS-enabled VHF radio. Open the cap, press the blue button, pop off the retainer to unfurl the 9-inch antenna, and hold the red button for five seconds. $199; nautiluslifeline.com

DAN Signaling Sausage

Bright orange and nearly 8 inches wide, this tube was

visible in the daytime from a half-mile away in our

test, thanks to a 2-inchwide vertical reflective strip that flashes in the sun. It has a mesh pouch that can hold emergency supplies, like a light and mirror. $80; dan.org/store

Tektite Strobe 3500

This emergency strobe has full 360-degree coverage, so you don’t have to aim it to be spotted. During our test, the strobe was clearly visible a mile away and became brighter as the sun set. Tektite says the three C batteries burn for 100 hours on flash; ours was still going like new after 70 hours. $89.95; tek-tite.com

Dive Alert Plus V.2 Air Horn

Its foghornish honk is

clearly audible from a mile away, is easy to install, and clips in between your hose and power inflater. Trust us, it’s earsplittingly loud. $89.95; divealert.com

Trident Fold-Up Divers Alert Flag

This collapsible flag can easily be stowed in a buoyancy-compensator pocket or attached to a D-ring, so it’s out of the way when it’s not needed. $25.95; leisurepro.com