The folks at TrackingTheWorld have already proven themselves to be pretty capable at tracking letters using GPS, but they've now moved up to some considerably more demanding tasks with their new WorldTracker Enduro device, which promises to track anything it's paired with through frigid temperatures, sweltering heat, and other harsh conditions. Of course, it'll also do that with all the accuracy you'd expect, with it making use of both standard GPS and aGPS to avoid any dropouts, and employing a a full range of cellular connectivity options to ensure that it always stays in touch. Better still, you can also pair it with an optional 8-cell lithium ion battery (pictured above), which not only provides some added protection, but lets the tracker operate for up to six months on a single charge. As with the letter tracker, however, this one apparently won't be available to the general public, but those with a fleet behind 'em can get in touch with TrackingTheWorld to talk pricing.