, Mark date and name of the diving site (provide GPS coordinates if possible)

, During the descent, mark the depth at which you met colder water

, Once you reach the depth of your choice, choose the area of your observation: it could be a limited surface (not smaller than the width of your opened arms in length and width) or a small itinerary at constant depth. You can feel free to do whatever you want! 5. Mark: observation depth, current, visibility

, Observe if there are some invasive species or other pressures, and mark the class of abundance for each one

G. Gatti, L. Thierry-de-ville-d'avray, R. David, C. Dimitriadis, V. Gerovasileiou et al., When data uploading is completed successfully, please take a photo of the tablet and keep it as a back up. Then, you can erase the tablet with a simple rubber and use it again as many times as you want! Guidelines to be cited as, Back home: upload your data and eventual photographs in the website, vol.12, 2015.