As long as you toss two at the entrance, then another two every fifty meters apart, they'll link together and form a network. Each minute, they'll send out a location signal. With a receiver in hand, you can roughly determine the position of all the locators.
No need for extreme precision—just getting a general direction, something for reference, that should be enough.
It's a simple technology. Once you have the idea, it's easy to make.
It hadn't even been two days before the Little Thief showed up again. Looking at the so-called new crossbow parts, his eyes went black.
The locators inlaid onto the thick, fragrant candles serving as crossbow arms, were so densely packed they looked like crushed diamonds.
