Midway-point between the authorities, or overshoot and see what's behind them. Depending on the scenery/layout placing 2-3 of these can make a big difference.
Also why not drop them from a small (less-noisy) drone? Drone with a camera can help surveil the situation from above, it can drop one of these balls, so you increase visibility by a lot.
Also why not drop them from a small (less-noisy) drone? Drone with a camera can help surveil the situation from above, it can drop one of these balls, so you increase visibility by a lot.