Garmin Edge 500 here. You need the cadence sensor (included with most packages) so it wouldn't do cadence on spin bikes unless they had the sensor, but you'd get everything else with the HR strap. It doesn't have maps (the bigger ones do) but it does HR, cadence (with the sensor), time, temp, grade, altitude, cals, max speed, pace, zones, direction and a billion other things. And when you upload the data to Garmin (free) or onto your computer (free software) you get a map of your travels anywhere in the world and nice graphs for all metrics. But it's bar/stem mounted so not so good for running (tiny though, so it would fit a pocket). So maybe the Forerunner is worth a look (not sure it does cadence though).




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