I'm going to quit bothering everyone with my "noob" GPS questions soon, promise.

But...

Take a look at the following image. The bike was on the trainer, in the garage. Blue line on the graph is speed. Notice it's relatively smooth at first (the unit was searching for satellites at this point). Once the unit decided there weren't any satellites in the garage it asked me if I wanted to continue with the GPS function turned off. I pushed "yes" and continued my little work out. This is the second day in a row it's looked like this.



Is this normal? Not a huge deal, just curious. Oh, also, the total ascent and descent is rather interesting as well. I didn't realize I was climbing that much on the trainer...

Thanks.