SECTION TWO - InstallationPage 8 961 INSTALLATION MANUAL Revision AUsing DGPS withan AN150 and8410 ACUIf the unit is equipped with a differential receiver (and you’re using theAN150 GPS antenna, not the AN205-P GPS/DGPS combo antenna), thisreceiver must be connected to a Northstar 8410 differential AntennaCoupling Unit (ACU). The ACU’s four-foot whip antenna should bemounted as high as conveniently possible (but not at the highest point)and as far away as possible from other antennas. The ACU can bemounted on a standard marine antenna mount (1" diameter, 14 threadsper inch).For complete details about installing the AN150/8410 ACU, see “Install-ing an 8410 ACU (for use with the AN150 only)” beginning on page 22.Using the DGPSantenna(AN205-P)For complete details about installing the AN205-P, see “Installing theantenna” beginning on page 14.Bench-testing the961It is recommended that you bench-test the unit before installing it on thevessel. Bench testing ensures that the equipment is fully operational, andallows the GPS receiver to collect its almanac and ephemeris data for theinstalled location, which results in less on-board installation time.