I downloaded a program called bubbler GPS for my phone (android) and have been playing with it. It works just like a spot tracker except it runs off your cell phone. The tracks are shown just like a spot tracker through spotwalla. The free version seems pretty basic, but lets you do custom messages at each stop vs the spot which has limited preset messages. The pro version ($10 from google play) looks to have a bunch more setting and features such as custom update intervals, the ability to send texts based on location, attach photos to spotwalla when sending a status message and save up to 1500 points for when you are not in cell range (vs the free version limit of 5).
I have the free version and it mapped me pretty accurately from work to my house.
http://bubblergps.com/