For example, the display in the photo shows the data in both a scalar and a tabular form. You may also want to use a graph. Instead of using the marker to plot the points and draw in the graph, use push-pins to indicate Secchi depths, and connect the pins with colored string or yarn. This way, the display can be used more than once. No matter how you choose to display your data, always be sure to include the name of the volunteer who collected it.
Volunteers work hard, and they deserve some recognition for their energy and dedication.