The ONIX Series products come standard with a 34 channel internal GPS antenna. For situations where an external GPS antenna is needed, an external GPS antenna can be purchased, either the AS GRP or the AS GPS HS.  Because there is no GPS connector on the back of the ONIX unit, you must also purchase an adapter cable.  The appropriate adapter will be dependent on your set up.  If you are only connecting the GPS antenna to the unit, you will need the AS GPS NMEA cable.  
 

The ION systems do not include a GPS antenna, but are designed with a built in back panel GPS-NMEA connector for use with our GPS CI.