The app is called Posidonia Maps, and its main promoter is Manu San Félix, a marine biologist who founded the Vellmari diving school on Formentera. Manu is on a mission to save the posidonia because he understands its importance to the Mediterranean - as a shelter to protect marine species and reducing carbon in the atmosphere.

Manu has spent years working with his camera to create an under-water map of the entire posidonia system. The way the app works is simple: When the captain of a boat is ready to drop anchor, he turns on the app which locates his boat and superimposes it on a map of the posidonia. Thus, the captain will be aware if he is over a posidonia meadow, and will move to a different location before dropping anchor. The entire area around Ibiza and Formentera has already been mapped, and work has begun on the coast of Mallorca, which also has posidonia.