I use the old garmin edge 305 & it has been really good but it's started to have the odd blip now and then.
anyway the thought I had is this, am I supposed to set the altitude to zero before I start my ride or does it do it automatically,
I presume it does it automatically but just thought I'd ask
due to the odd blip, I'm starting to look around at newer gps units, so be prepared for some dumb questions in the near future