SECTION ONE: IntroductionPage 2 957 Installation Manual, Revision C1Scope of thismanualIn this manual, you’ll find information about the followingtopics:• wiring and installing the 957• wiring and installing the 2201 antenna or optional 2701DGPS/WAAS receiver• configuring the NMEA ports for NMEA 0183 devices• configuring the AUX port for the optional 490 echosounder• interfacing the 957 with an optional remote display• NTSC video inputs for docking, engine room, security,entertainment, etc.• testing and troubleshooting the 957 installation• the technical specifications for the 957, 2201 antenna, and2701 receiverFor instructions on connecting the 957 to the Northstar 490echo sounder, see the Northstar 490 Installation Manual (partnumber GM491), included in the 490 shipping carton.Major installationstepsThe following list of recommended installation steps isn’t asubstitute for all the details in this manual. To ensure that youmeet all of the installation requirements, be sure to read thisentire manual and follow its recommendations closely.Northstar suggests following the steps as outlined below.PRE-INSTALLATION:Step 1. Check the shipping carton for any damage, andimmediately report any damage to the carrier. Save allpacking material in case you have to return any systemcomponents to the Northstar factory for service.Step 2. Fill out the warranty card and mail it to Northstar.Step 3. Unpack the carton, and check its contents. You shouldhave received the following parts:• 957 unit• flush-mount hardware kit (P/N 957PK)• flush-mount gasket (P/N HG366)• 10-foot interface cable (P/N WA215)• 10-foot power cable (P/N WA535-A)For instructions on usingthe 957, see the Northstar957 Operator’s Manual(part number GM957UG)