Here you can find a guide to creating a propper visual bank for seashore monitoring.
The example is based on a successful case at the Riviera Maya (Xcacel-Xcacelito), build by local people who daily take pictures from the same spot.
Using a common Facebook page, locals have agreed to daily upload 8 photographs from the same spot. Through this visual record, anyone can see the Sargassum Behavior at the seashore (for personal touristic purposes, scientific study, economic impact, etc.)
It doesn´t cost a penny and offers accurate information.
This experiment was conducted by the World Organization Institute.