Beelining is an ancient art used to locate feral bee colonies by capturing and marking foraging worker bees, then releasing them from various points to establish (by elementary trigonometry) the direction and distance of the colony's home. Beeliners generally have homemade capture boxes which aid them in their quest.

There are several ways to "beeline", and you can read about some of the articles that describe the different methods.

Be sure to watch the Beelining Demo to get an overview of how to beeline.