A few years ago waterproof cameras were big, heavy and most of them needed additional plumb to stay under water.
But good old times changed and nowadays the waterproof cameras are small, lightweight, record movies in high definition but they sink in water.
O.k. modern things are not always bad, you get quite good pictures with these small wonders, but the sinking is a big annoyance.
Step 1: So Lets Built a Buoy for It.
But not just a buoy, but a floating tray, on which the camera is served every time it is needed.
What you need is:
a small ring of styrofoam 17cm diameter (You can get this from your local hand craft shop, it is intended to be used to make a wreath)
some cloth 60 x 30 cm (I took organza, which is synthetic, light weight and open.)
some thread to sew it
a sewing pin or a sewing machine
an old shoelace
Step 2: Prepare the Cloth
First cut the organza to make two pieces of cloth that are bigger than the styrofoam ring.
Put the styrofoam ring on top of them and draw the inner circle with some pen. Sew the two pieces together along the line that you just made.
Tie the shoelace around the ring.
Step 3: Sew It
Now take the upper part of the cloth and pull it through the ring.
Get the two pieces together again on the outside of the ring and fix it with small pins.
Now we only need to sew around the thing to get it close. Take care the shoelace is also good connected to the seam.
After the first round of sewing the thing is closed and the edges of the organza might be trimmed. Then, without interrupting the sewing, change the stitching style from straigt to zigzag and fringe the border.
Carefully make a knot between the beginning and the end of the thread.
Step 4: Use It!
To use it, just loop the wrist strap of the camera through the shoelace and fix the buoy to the camera.
Have fun in the water!