I do not need to use kneeboards now as my machine comes with a map/chart holder on each side. When I was using kneeboards I find that those sold in the market are cumbbersome and at times can restrict the collective movement. I had actually made a homemade cloth strap(about 2 inches wide) from an old uniform trousers and on top of it is a transparent plastic to slot the map / chart in.. The ends are held together by velcro. By far, I find my "invention" (patent pending) to be the best. If anyone needs more details, PM me for some photos! It is still free of charge!