Yea, and quite unofficially. A piece of string with 3.5 nms per minute markers for a 1/4 mil chart. About 2.5 hrs long! Threw it on the chart, fixed one end to the TAP and 'rubberbanded' it to the POD for the length of sortie (usually 1.5 hrs). By now you will have guessed the ac.
Worked very well in the UK flying at 210 IAS, adjusted for W/V to fly 210 G/S. I shudder to think what the BOI would have said - illegal use of parcel string. Oh hum!