Hi all, just wanted to share I have been using google calendar to schedule all of my appointments. I can even input the address of each service call along with notes etc. When I finish a job I open google calenadar on my cell to see where I'm off to next, tap the address and google maps will navigate me right to the address. I can the tap on their phone number to give them a call that I am on the way.
When you get within 200ft of your destination, google maps will even show you a picture of the house you are looking for in most cases. Really cool and all free.
Give it a try if you are a one man op like I am.