GPS Insight includes the ability to group vehicles and assign shapes to them, and also color-codes them based on what their activity is.
Now that works on most mobile mapping platforms – but NOT on the iPhone, which isn’t up to date yet 
Additionally, we reduced the length of the URL you need to type (once) to get to your vehicles on GPS Insight on your smart phone.
Here are some screenshots:
Here is a list of your vehicles — scroll and choose one to drill down to see it on the map:
New Shapes, Colors, and Directional Arrows in Mobile Maps
Viewing many vehicles, most stopped > 1 hour (red) at GPS Insight headquarters. No idea what Google thinks “House Hangout” is.
Lots of stopped vehicles at GPS Insight Headquarters
Note that now we show the direction of travel on the phone as well with an arrow:
One moving up in Seattle
Clicking through gives more information:
Detailed information about a vehicle
If you are a GPS Insight user, here is how you access the administration area to create your unique URL which you can then use to see current locations of your vehicles on your phone running Google Mobile Maps (most phones):
GPS Insight Mobile Map Administration
Enjoy!
Rob.