The Nautilus LifeLine is a marine rescue radio with GPS that puts safety into the hands of everyone on the water. Use it to chat to your boats or buddies in the their kayaks or canoes with the push of the green button. Need help? Push the red button to send an alert message and your position to boats within 4000 square miles. This tough and compact unit is depth rated to 425 feet (130 meters). It provides true peace of mind for everyone on the water including divers, kiteboarders, sailors, paddlers, commercial mariners, jet skis, canoeing, coastal cruising and more.