MXS and MXG are the new AiM dashloggers designed to acquire and display data coming from your ECU, the internal accelerometer and gyro, as well as from the GPS Module included in the kit, analog/digital inputs and predefined math channels. 

This dash comes with the standard GPS 08 module (magnetic base) capable of picking up nearly 20 satellites, to greatly improve accuracy.  There is also  a thru the roof mounted GPS 08 available but it must be specified at the time of the order.  Here is a link to the GPS 08 information:

Performance and data acquired can also be incremented adding up to eight expansion modules.
The only difference between the MXS and MXG is size: a compact 5" display for MXS, a 7" display for MXG, better fit for wide cockpit installations.