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I'm not sure how practical that would be, primarily because in most cases with letterbox hybrids you don't actually end up with corrected coordinates. With mystery and multi caches, the final answer is usually just a set of coordinates that you plug in, but with letterboxes you're usually just following instructions, so unless you get to the final, take your own coordinate reading with your device at GZ, and then add in those coords, you're not likely to actually get corrected coordinates.