The SAM (Society of Antique Modelers) in our club, well, most of them, use an electronic locator on their planes.

If you are not aware of what the SAM people do, well, they have aircraft that were designed before I believe 1940. They have to use certain engines, and they usually build them from scratch using such things as fabric and dope for covering. All of them are absolutely gorgeous aircraft. These guys are usually 'old timers' and have build skills that many of wish we had.

They hand launch or ground launch, and the planes head straight up as best they can. They have a limited fuel capacity (measured in seconds) and after they run out of fuel, they are basically gliders. So, they can, and will, go wherever, based on the wind speed and direction. So, many of them will get sort of out of hand, and they will wander off. So, they use those electroinc locators all the time and, for the most part, they work.