[ ground-plot ]
/ ˈgraʊndˌplɒt /
Aeronautics. a method for obtaining the position of an aircraft by multiplying its groundspeed by its time in flight and marking off the product with respect to its starting position.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for groundplot
The groundplot of it was fifty feet by forty-five; each end is formed by four stout posts, fixed perpendicularly in the ground.