The someone else is right. The GPS05 module connects to a powered data hub that is sold with the GPS module. The data hub then connects to the M4. http://s1139.photobucket.com/user/backlite/media/schema_di_collegamento_mychron4_zps47522373.gif.html
Not quite sure what you’re looking for here. The M3/Gold does have a lateral accelerometer. To get a lateral accelerometer on an M4 you would need to purchase an E-Box. IMO, if you’re getting the GPS module, getting an E-Box to go with it is not necessary. You should more than enough data from the GPS.
When viewing your M3/Gold in Race Studio, enable LatAcc under MEASURES table on the Measures Graph. With a GPS module, enable the GPS_LatAcc measurement.
Hope this helps a bit
LAD Specialties customer / tony kart / rotax / kt100