Hi Geoff,
That's odd -- I would think the data would be there just as it is in other units, such as the Dakota. I have an eTrex 20, unfortunately, which I purchased before I realized it didn't support HR. So are you copying/opening the Current.gpx file from your 30? And TF opens that file with HR just fine? That's strange because that's all TF does, is open that file.
Let me know. I'll probably be selling my 20 and getting a 30, but not immediately.
Thanks.