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I went for a run with my club tonight, we did about 7 miles. I wore my Garmin Forerunner 305 as usual, and also as usual I didn't wear the chest strap to get a heart rate reading. But (and this is not usual) when I uploaded the data from my 305 I had a heart rate reading for the run. It looks like it was accurate too, because I do occasionally wear the chest strap just to check my heart rate and so I know what the readings are likely to be. I wonder if it's possible for a 305 to pick up a signal from some where on my body without me wearing the chest strap. Maybe the heart itself gives off a bit of an electronic signal?