27-Jul-2008 -- 0N 9E, on the equator line, lies in the open sea, 37 km far from the Gabonese coast, and 44 km far from a 132 meters high hill, near Kobékobe.
So the question clearly was whether some piece of ground would be visible from the spot. According to the formula...
D/km = 3.6 √ h1/m + 3.6 √ h2/m
... it should have been, ... but it wasn't, though the weather was clear. See view from the spot looking east towards the coast, south, west, and north with the team.
Our trip had started in Libreville, and after a short stop on Pointe Denis beach, we went around Pointe Denis and Moustache lighthouse.
The sea was fair, and we did our way to the spot at 45 km/h without any trouble. On the way back we met some friendly whales.