The best way to keep track of your cat is to not let it outside. Benefits:<p>1. Zero cost for cat tracking devices, never need to charge them, never need to worry about the cat losing the device.<p>2. Dramatically reduced chance of your cat being killed by a car. Despite blogs claiming otherwise, I can find no reputable statistics on the number of pets killed by cars in the US, but there are >250k collisions with animals every year. Most are deer, but anecdotally I know many many people who have killed cats accidentally.<p>3. Dramatically reduced chance of your cat being killed by a coyote or raccoon. Yes, coyotes and raccoons will <i>absolutely</i> fuck up your cat. Yes, they are very likely in your city.<p>4. Your cat will not be playing a part in the wholesale slaughter of billions of birds, small mammals, reptiles, and other fauna that domesticated cats are responsible for.<p>5. Significantly longer predicted lifespan for your cat. The life expectancy for an indoor cat is about 14 years. For an outdoor cat, it's <i>2 to 5 years.</i><p>6. Your neighbors will appreciate not stumbling onto your cat's poop while gardening.<p>Seriously, keep your cat indoors.