Endomondo app users?

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I'm a newish runner (finished C25K in November) and I've been using the Endomondo app to track my runs. I've been really happy with it so far. It seems to be reliable.

Today, however, when I was about 4 minutes into my run, the app announced that I'd completed my first mile. Since I'm pretty sure I'm not setting any records here and I usually run 9-11 minute miles, this is obviously an error. The map has me running right into the middle of the lake.

Any idea what causes this kind of error? Is it the app itself or my phone's GPS? How can I make sure it doesn't happen again? Does anybody use a different, more reliable app?

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