Top speed way off – iSkate - GPS skating computer for inline and roller skates Review

I have a track that says my top speed is 11.4 mph, and took a screen shot that showed me at 14 mph. No trees or tall buildings in the way..Really disappointing that for the past few years it has lied to me about top speeds.
Review by (w on iSkate - GPS skating computer for inline and roller skates.