Daylight? Currently the sun sets at 1837 near Mauritius. They reported the crash at 1510UTC. As far as I can figure, Mauritius is UTC+4. Assuming they didn't report the crash immediately, they would have crashed less than a half hour after sunset. Meaning: It wasn't even dark. Scroll down for details and photos.
So we're looking at a pretty well known set of islands. It's around sunset. There is a lighthouse. There are houses and trees. Obviously the navigation failed somehow. The lookout also failed. How about the standard precaution when sailing in unknown waters: Depth alert!?