I use a forerunner 305 that does the mapping itself, calculates distance, calories, altitude, speed, heart rate, averages and keeps a log of all of it for comparison and constant improvement. For music accompainment, i use my w810i with a 2gb ms, now, tht's what i cal a running tool.
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I use a forerunner 305 that does the mapping itself, calculates distance, calories, altitude, speed, heart rate, averages and keeps a log of all of it for comparison and constant improvement. For music accompainment, i use my w810i with a 2gb ms, now, tht's what i cal a running tool.