Catalyst,
Thank you for your inquiry. If the Furuno GP-320B antenna is no longer available in your local area, yes it is possible to utilize the GP7000F as the position source for your RDP149. On the GP7000 in the menu---advanced---input/output----NMEA1 output ensure that sentences ZDA, GGA, VTG are highlighted (on). On the RDP149 ensure that the position source is changed to "ALL". you will need to ensure that the GP7000 is fully operational & has a position fix in order for it to provide this information to the RDP149 via NMEA0183.