Both major apps stores offer RunKeeper GPS, a free app, initially, that's so popular with runners that it passed the 25 million user mark last year. It loads GPS maps quickly and then monitors the user's speed and tracks distances. It can be used for biking, walking or tracking a weight-loss program. Higher-level training for marathons is also available with audio coaching tips.
An elite training program is $40 a year and can be purchased in-app. It works on Android smartphones, iPhones and Pebble or Samsung Galaxy Gear smartwatches, (Apple's first iWatch seems a prime candidate, too). Even with its varied features, one reviewer asked if the app's designer, FitnessKeeper, could include outside temperatures with his running history.