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Introduction
Capabilities
Designed for detailed electronic charting capability, the Garmin GPSMAP 178/178C Sounder is a
powerful navigation device that can give you the information you need:
Precision Performance
• (178) 10 level grayscale FSTN display with backlighting
• (178C) High-contrast, 256-color LCD screen with backlighting
• 12-channel parallel receiver tracks and uses up to 12 satellites for fast, accurate positioning
• WAAS Capable — receive signals from the additional set of WAAS (Wide Area Augmentation
System) satellites to give you better accuracy
• Differential-Ready — just add an optional Garmin beacon receiver for better than 5-meter accuracy
• Fully gasketed, high-impact plastic alloy case, waterproof to IEC 529 IPX7
Advanced Navigating and Plotting
• 3000 alphanumeric waypoints with selectable icons and comments
• Built-in Worldwide marine basemap to 20 miles includes detailed ocean, river and lake coast-
lines, cities, interstates, US state highways, and local thoroughfares
• 50 reversible routes with up to 50 waypoints each
• Uploadable maps using Garmin’s MapSource™ PC products and BlueChart™ Data Cards
• Coordinates: Lat/Lon, UTM/UPS, Loran TD, plus over 20 grids, including Maidenhead
• TracBack route feature which allows you to quickly retrace your track log to a starting position
• Built-in simulator mode
• Built-in tide information from over 3,000 tide stations around the USA coastline, Alaska, Hawaii,
western Canada and several Caribbean Islands
Superior Fishfinding Ability
• 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