The Map Dashboard allows you to send and receive messages to / from a vehicle / driver via SMS (not email). The driver or vehicle must have an SMS number set under the driver’s or vehicle’s profile. SMS messages sent from the Map Dashboard are delivered to a driver’s mobile device via 477-477 (GPSGPS). Any messages replied from a driver are displayed in message history on the Conversations tab and from the driver Message history, which you can access from the vehicle card.