Like Red1....... I also use a Loran board , but my friend uses a metal rectangle food tray with magnets on to hold the paper chart, and props it up with cushions.
I have the loran board somewhere in my stash. I think they are great to hold your chart in place; mine came with the magnetic magnifier. Which in my opinion is a pain because you have to keep moving it to colour in what you have done on the chart. :( But the board is great! :)
I use a magnetic board - not a Loran one but the same thing. I use magnetic strips to mark where I am which means I can colour in where Ive embroidered without moving the strip.
Have you thought about making one? I bought a piece of sheet metal in a home improvements centre. Its the width of two sheets of paper side by side and as tall. I painted it, added strip magnets I found in a crafts store and put it on my table top easel and use the magnets to keep my place.