Yes, you need permission, and we can sometimes get it depending on how useful the data would be for other parties (NWS, coast guard, etc.). We have to go solar power with telemetry which makes the installation more expensive and more logistically complicated, but we're doing more and more of these that way. They are really the best locations because they're typically right on the water and have 360 degrees of clean fetch.
If you know of any markers like this, the best thing you can do is give me as much detail on it as you can (general location, digital pics, lat/lon, ID, official name from nautical charts, etc.).
David
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