We have just upgraded from a 9750 to a 9760 and the 9760 has the brownbox and ITC globe, but the brown box does not have a spot to put a key card? im thinking i need a mobile processor. should i buy new or get one used somewhere? second question will be what kind of key card do i need to record maps and such sort? We are new to greenstar and im just reserching into everything that im needing to know to have harvest go smoothly