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The Garmin Astro 220 DC 30 Bundle GPS Dog Tracking System ($599.95 at Amazon.com, Sears, and REI) is designed for hunters and sportsmen but it also works for adventurers who run or hike with their dogs. (Photo by MCT Stock Photo - Alamy
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Amazon.com: Garmin Rally RS200, Dual-sensing Power Meter, Compatible with SHIMANO SPD-SL Cleats : Everything Else
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