A year or two ago I wrote about a couple we met that had done exactly that with a Hummingbird Wireless Fish Finder of the type one casts out with a fishing rod. It was installed in the hull of a modest sized RC boat that the lady controlled from the bow where she could give directions to her husband at the helm via a Cruising Solutions wireless headset. The arrangement seemed to work pretty well.Putting a depth sounder on a RC boat with some telemetry to feed back the depths feels like it would be more useful.
It could be made to zig zag ahead of the mother ship and show actual depths on an overlay on the chart plotter.
This would save quite a few groundings if used on the south coast of Grenada alone.
Me, I guess I will still be standing up and looking over the dodger while I enter on a day with good light.
The "dipping sonar" approach I referred to above, would use the Hummingbird Smartcast RF25 with the transducer float hanging from a length of fishing line attached to the UAV's skids:A Parrot quadcopter, with a 1/2 ounce fishing weight and eight or ten feet of fishing line dangling beneath it, perhaps?
These quadcopters are waterproof and can land in, and takeoff from water. Mount a GoPro camera and a wireless depthfinder on one:Using an Unmanned Aerial Vehicle for forward reconnaissance of potentially difficult anchorages/passes may be becoming a possibility
Of course, several of the highly advanced military drones in service over the last couple of decades are capable of such duty, and could be tasked to SAR. There have been cases of them being used for other purely civilian purposes, such as the Predator used by the California Air National Guard to assist with the Rim Fire in and around Yosemite just a few months ago.Seems to me these UAV's, particularly the longer-legged ones, would be ideal for searching for endangered missing persons. I mean, if they can look for, and actually attack people in other countries, why not have a couple for search and rescue?
And Frogwatch, Yves Gelinas did something similar, albeit without wireless....they called it film back then, aboard his boat (Jean du Sud) many, many years ago. He used a kite.
The flight time of the UAV referred to in my original post (#1) is reported as 25 minutes out of the box by the manufacturer.Of course, several of the highly advanced military drones in service over the last couple of decades are capable of such duty, and could be tasked to SAR. There have been cases of them being used for other purely civilian purposes, such as the Predator used by the California Air National Guard to assist with the Rim Fire in and around Yosemite just a few months ago.
However, the type of Radio Controlled (RC) Quadcopter in this thread has flight times measured in minutes, typically not much over 10 minutes. To extend flight times, you can use a higher capacity battery (measured in MAH, miliamp-hours), but there is a point at which the several curves of lift capacity, battery capacity, and total aircraft weight put a finite limit on flight time.