,GPSMAP 178C SounderStandard and Optional TransducersUnit part numbers 010-00340-00 and 010-00340-01include a single-frequency 200kHz, plastic, depth and temp,transom mount transducer.Unit part numbers 010-00340-02 and 010-00340-03include a dual-frequency 200/50kHz,, plastic, depth andtemp, transom mount transducer.Unit part numbers 010-00340-04 and 010-00340-05 donot include a transducer.For a complete list of optional transducers, contact yourGarmin Dealer or Garmin direct.For the most recent list of available accessories foryour GPS unit, current user manuals and softwareupdates, visit our web site at www.garmin.com.viPacking ListIntroduction Before installing and getting started with your unit, please check to see that your package includesthe following items. If any parts are missing, please contact your Garmin dealer immediately.Standard Package:• GPSMAP 178C Sounder Unit• GA 29 Remote External Antenna and 30’ cable*• Internal Antenna**• Single-Knob Tilt & Swivel Bracket• Power/Data Cable• Owner’s Manual• Quick Reference Card• Protective Cover* Not included with part numbers 010-00340-01, 010-00340-03, or 010-003410-05 with internal antenna.** Not included with part numbers 010-00340-00, 010-00340-02, or 010-003410-04 with remote antenna.Optional Accessories:• US A/C PC Adapter• EURO A/C PC Adapter• Cigarette Lighter Adapter• BlueChart Marine Data Cards, MapSource CDs, USB Data Card Programmer and Data Cards• USB Data Card Programmer• GBR 21 Beacon Receiver for differential corrections• Transducers/Temperature Sensors/Water Speed Sensors/Extension Cables