I think the best part of the Garmin (or other radar style chronographs) is that now I can capture speeds while shooting rocks etc. at all ranges out in the field. Usually, I just shoot over a traditional chronograph when zeroing, but then when I'm field shooting, it's not practical (or if shooting off a hill, there's no place for a chronograph).
But the Garmin I just stick in my pack, hike to wherever I'm shooting, and then it's just on the mat next to me - really helps seeing oddities in elevation at distance and seeing realtime what the speed is.
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