You mean like a nomograph??
Or do you want something that calculates speed??
If you time the contact for 3 minutes, then measure the distance moved and divide by 100, you'll get there speed in knots.
With a nomograph you could do the following.
Let's say the contact has been measured for 2 mins, and moved 1200yrds. Draw a line on the nomo connnecting the distancc and the time point, and they will cross, the speed line, at the targets appox. speed. You can use a nomo to figure. Either Speed, distance, or time to move X distance, as long as you have the other variables.
A nomo is included in TMO...not sure what else might include one.
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