Another vote for Cyclemeter. I used to use Mapmyride before I had a handlebar mount for my phone, and used the 30 second delay so I could toss the phone into my pannier. Then, upon reaching my destination, half the time would see, "GPS signal is low; start anyway?" You could have heard my howls of outrage three states away. So I switched to Cyclemeter and could not be happier.