- Standard commercial school issue
- 128mm square.
- 0-360 scale on outside edge with reverse 360-0 scale adjacent
- Location letters N.E., S.E., S.W., and N.W on corners.
- With aeronautical symbol cut-outs of a square, circle and triangle
- Centre drilled for location and gridded in squares of 13mm(4nm).
- Supplied in a self-sealing clear plastic case