A RUDIMENTARY MAP HOLDER FOR SKI-ORIENTEERING
Trying to follow your ski-O course on a hand-held map in a slippery map case is really awkward with ski-gloves and poles in your hands! The basic solution is to pin the top of the plastic map case to your jacket so you can flip up the map from the bottom to read it. But that method means you cannot turn the map to the direction you want to travel!
For a high-end product you can buy ($100 + shipping) a fancy body-harness map holder with pivoting top plate like the "pros" use. Check out: http://www.nordenmark.com/products.html
Or, you can make, for about $3, a simple map holder with pivoting top plate. The base plate and top plate can be foam board or similar material. The neck and waist elastic should be stretchy enough to pivot the board easily towards you from the bottom. The plates are firmly held together with a large brass split pin. A standard map case that has been pulled over the top plate before attaching it to the base plate holds the map. The head of the split pin should also be inside the map case so the map slips easily into the case. Duct tape the split ends of the pin securely against the base plate to avoid snags.

OK, so it does not look very snazzy - but it works. Bring a strip of tape with
you to seal map case closed after you insert the map at the Start Line.
The only operational problem is that after you have turned the top plate and studied the next leg of your course, it will probably not stay in the same position as you ski along the trails. You can use clothes pegs, large fold-back clips, etc. to hold it firmly (in it's new position) against the base. A more elegant solution would be a plate-to-plate fastener that you could easily loosen or tighten with gloves on! I leave that up to you to invent.
Bill A.