A glide slope ruler is a simple device for determining how much altitude you need to cover a given distance. The ruler is constructed to include a safety factor, and accounts for headwinds from 0 to 20 knots.
This template can be used to create a customized glide slope ruler for your particular glider and desired safety factor. Instructions are included (excerpted from Chapter 15 of the Glider Pilot’s Handbook of Aeronautical Knowledge) which cover the construction and use of the ruler.
The reverse side of the ruler includes the takeoff checklist taught in the Flight Training Manual for Gliders, with extra room for writing in additional items specific to your glider.