Alexandre Mateos and Mathieu Rouanet show us how to make a map holder for navigation tasks
Photos by Antoine Mateos.

YOU WILL NEED …
Materials
1 sheet of 30 - 40mm polystyrene
1 light but solid rod
Appx 1.5m elastic cord
1 carabiner
1 swivel
1 sheet of clear, self-adhesive book-covering material
Sticky tape
Tools
Pencil
Screwdriver
Craft knife
Compass
Drawing pins

Draw a circle from 35 - 40 cm diameter. (We found 38cm to be ideal)

Cut out the circle using the knife.

Cut the rod to about 30cm.

Carefully cut a rod-lengthed slot into the centre of the polystyrene (not all the way through) to house the rod, and keep the offcuts to cover the rod later.

Make a hole in the centre of the disc, using the screwdriver.

Place the rod along the slot, and secure it in place by threading the cord in and out of the hole several times.

At the back, wind the loops onto the carabiner and tie off, leaving a tail of 1cm.

Cut a strip lengthwise from the piece of polystyrene taken out of the slot.

Cover the rod with the strip, and tape it into place.

Stick the transparent film in place, taking care to avoid bubbles and creases.

You can write on the plastic with a permanent marker, and wipe it off with alcohol.

Attach the swivel to the elastic cord, leaving a length with a knot

Thread the elastic cord through the gap in the harness (by the seat plate)

Fix the elastic cord either to the seat plate or to a leg loop, with a knot

Ease the swivel through the hole

Strap yourself into your harness and pull on the end of the elastic cord to get hold of the swivel and attach the map case.

You are ready to launch! The elasticity of the cord means the map case won’t get in the way when you run, and the map case will stay flat against your legs. The map can be pinned onto the polystyrene, and the edges taped down to stop it from flying away!
