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Garmin GPSMAP 178C – For Sale

• New / Used Garmin 178C •


4.5″  Chartplotter | Fishfinder » Color Display  » WAAS Capable | 12 Channel GPS »  Worldwide Basemap | 3000 Waypoints | 50 Routes | 15 Tracks » US Tides

Built-In 500W Sounder | 50/200kHz


Garmin GPSMAP 178C on Ebay

April 22, 2024 3:42 pm EDT

Garmin 178C Specifications
Dimensions 6.3″ x 4.9″ x 2.8″
Weight 1.2 lb (553 g)
Waterproof IPX7
Display Type 256-color CSTN
Display Size 3.2″ x 3.2″
Display Resolution 320 x 320 pixels
Mounting Options
Bail with Swivel or Flush
Accepts Data Cards
1 Garmin Data Card
Waypoints 3,000
Navigation Routes 50
Receiver GPS Receiver
NMEA 0183 Compatible Yes
NMEA0183 Input Ports 2
Video Input Ports None
Video Output Ports None
Garmin Marine Network Ports None

• Current Listings •

Garmin GPSMAP 178C  – Show All Listings

Garmin GPSMAP 178C on Ebay

Garmin 178C Replacement | Upgrade | Best Price


Downloadable Manual 

Garmin GPSMAP 178C - Manual

Garmin 178C – Manual




Key Features



  • High-contrast, 256-color LCD screen with backlighting
  • 12-channel GPS for fast, accurate positioning
  • WAAS Capable – receive signals from the additional set of WAAS satellites for better accuracy
  • Differential-Ready – optional Garmin beacon receiver for better than 5-meter accuracy
  • Waterproof to IPX7


Advanced Navigating & Plotting

  • 3000 alphanumeric waypoints | selectable icons | comments | depths & water temp
  • Built-in Worldwide marine basemap to 20 miles | detailed ocean, river and lake coast-lines
  • 50 reversible routes with up to 50 waypoints each
  • Uploadable maps using Garmin’s MapSource™ PC products & BlueChart™ Data Cards
  • Coordinates: Lat/Lon, UTM/UPS, Loran TD, plus over 20 grids, including Maidenhead
  • TracBack route feature to quickly retrace your track to a starting position
  • 15 Saved Tracks
  • Built-in simulator mode
  • Built-in tide information from over 3,000 tide stations  | USA coastline, Alaska, Hawaii, western Canada and several Caribbean Islands


Superior Fishfinder

  • Dual Frequency 50/200kHz | 500w Power output
  • Whiteline feature provides a clear image of both bottom hardness and structure
  • See-Thru® technology helps separate fish returns from thermoclines and structure
  • Multiple zoom levels with a moving view window
  • Underwater waypoint marking
  • Map/Sonar split screen combines navigation and fishfinding information
  • Fish and depth alarms



Garmin GPSMAP 178C - Sonar

Garmin 178C –  Sonar




Garmin GPSMAP 178C - Dual Frequency Sounder

Garmin 178C – Dual Frequency Sounder





Garmin GPSMAP 178C for sale

Garmin GPSMAP 178C





Garmin 178C Power Connection

Garmin 178C Power / Data


Power/Data Connections – The power/data cable connects the GPSMAP 178C to a DC system and provides interface capabilities for connecting external devices.

The color code in the diagram above shows harness connections.


New & Used - Garmin Marine Electronics

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Garmin GPSMAP 178C For Sale

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