It's a metric to imperial converter table, 1:st column is distance, 2:nd hight.
From left side 1:st row: 0.5?, 1nm ≈ 1.9km, 1645 feet ≈ 500m, 152?
If someone can explain what the 0.5 & 152 represents? that would be grate!
Personally I like this paper table in a plastic cover, gives the cockpit even more personality ;) IMHO.