"It is the airport overlay, if you hover your pointer over the red circles they will show you the airport name. Baically to show you when you are close to an airport. You can turn it off in the configuration tab, as detailed in this post:…"
"Ouch - You are living one of my biggest nightmares. First off, I am very sorry, but hopefully we can salvage as much as possible. While I don't have a experience with the drones electronics, I have salvaged more stuff than I should have from water…"