Now (map)
The now map is where your vehicles are currently based on the last reported event or position. Each event, like engine on, off, or driving, contain a time stamp which shows you when that event happened.
There are many events each device will report. To see the list of events and their meaning go here.
Video tutorial
(3:12)
Troubleshooting
GPS fix validity
If a vehicle isn't reporting it's location, or it's wrong: