The Garmin GPSMAP® 178C Sounder is a new-generation fully integrated chartplotter and powerful sonar, offering the same brilliant sunlight-readable color LCD, powerful features, and simple interface as the GPSMAP 172C all in a compact, value-priced console that leaves fish nowhere to hide.

It comes standard with a built-in worldwide marine basemap and accepts MapSource® BlueChart® offshore marine cartography—featuring detailed depth contours, inter-tidal zones, wrecks, navaids, and many other points of interest. For small-water anglers, the GPSMAP 178C Sounder is compatible with MapSource Recreational Lakes with Fishing Hot Spots—featuring fishing areas, boat ramps, marinas, and hazards for hundreds of popular U.S. and Canadian lakes. Pre-programmed data cards can be easily inserted into the slot on the front of the unit.

Features:

320 x 320-pixel, 256-color CSTN screen with adjustable CCFL backlight
3.2" H x 3.2" W (4.5" diagonal) viewing area
4.9�H x 6.3�W x 2.8�D unit dimensions
State-of-the-art 200 MHz processor makes data acquisition, panning, and zooming virtually instantaneous
Choose either a dual-frequency 50/200 kHz transducer for offshore boating or a single-frequency 200 kHz transducer for inland lakes and bays
See-Thru® technology (which separates fish from thermoclines and structure) and Depth Control Gain (DCG®) for detailed images of structure and bottom densities
New digital display technology offers an easy-to-read, semi-transparent digital readout that allows users to see sonar images "behind" the data
User waypoints are automatically tagged with the date and time of creation, as well as water temperature and depth—vital information for serious anglers
10,000 active track points and 700 saved track points; database information can be stored on removable data cards and transferred to a PC or another unit
Sends, receives, and displays positioning data with DSC equipped VHF radios
TracBackâ„¢ mode helps guide you back to points along a route
Tracklines can be color-coded for trolling or cruising applications
500-watt (RMS) 4000-watt (PTP) output with dual-frequency transducer
400-watt (RMS) 3200-watt (PTP) output with single-frequency transducer
Adjustable range, gain, zoom, and bottom lock
Temperature log maintains a graphical record of temperature data
Shallow-water, deep-water, fish-by-size, timer, low-battery-voltage, anchor-drag, arrival, off-course, proximity-waypoint, and clock alarms
Water temperature and fish ID with depth alarms

Additional Specification

Navigation Features

Waypoints/icons: 3,000 waypoints with name, symbol, depth and water symbols, 10 proximity
Routes: 50 reversible routes with up to 50 points each, plus MOB and TracBack modes
Tracks: 10,000 point automatic track log; 15 saved tracks ( up to 700 track points eact) let you retrace your path in both directions
Trip computer: Trip odometer, stopped time, moving average, moving time, total average, total time, maximum speed, odometer
Alarms: Anchor drag, arrival, off-course, proximity waypoint and clock
Tables: Built-in celestial tables for sun and moon by date and position
Tides: Tide data( ( U.S.A only)
Map datums: More than 106 including user datum
Position format: Lat/Lon, UTM/UPS, Maidenhead, MGRS, Loran TDs and other grids
DSC Support: Yes

GPS Performance

Receiver: WAAS enabled, 12 paraller channer GPS receiver continuously tracks and uses up to 12 satellites to compute and update your position

Acquisition times:

Warm: Approximately 15 seconds
Cold: Approximately 45 seconds
AutoLocate: Approximately 5 minutes
Update rate: 1/second, continuous

GPS accuracy:

Position: < 15 meters,(49 feet) 95% typical
Velocity: 0.05 meter/sec steady state
Interfaces: NMEA 0183 (2 inputs), RTCM 104 DGPS corrections and outputs
Antenna: Choice of Internal QuadHelix or External QuadHelix ( GA 29 remote marine mount with 30’ cable)

Plotter / moving map features

Basemap: Built-in Worldwide Marine basemap to 32 nm with coastlines, rivers, lakes, political boundaries, tide data for U.S., cities, interstates, U.S. state highways and major thoroughfares
Uploadable maps: Accepts preprogrammed or user-programmed Garmin data cards containing optional MapSource cartography
Plotting scales: 20 feet to 800 nm with dedicated push-button zoom control

Power

Source: 10-35 Vdc
Usage:
GPSMAP 172C/172 = 6 watts
GPSMAP 178C/178 = 14 watts

Physical

Size: 4.9�H x 6.3�Wx2.8�D (122.5 x 157.5 x 71 mm)

Weight:
172C/172 = 1 lb. 1 oz.
178C/178 = 1 lb. 3.5 oz.

Display:
3.2�W x 3.2�H, 320 x 320 pixels with adjustable CCFL backlighting
172C/178C = 256 color CSTN
172/178 = 10-level FSTN
Case: Fully gasketed, high impact plastic alloy, waterproof to IEC 60529 IPX7 standards
Temperature range: 5ºF to 131ºF (-15ºC to 50ºC)
User data storage: Internal backup of user settings, no memory battery required

Depth Sounder features (GPSMAP 178/178C Sounder only)

Frequency: 50/200 kHz or 200 kHz

Transmit power:

500 watts (RMS), 4000 watts ( peak-to-peak) w/ dual frequency transducer
400 watts (RMS), 3200 watts ( peak-to-peak) w/ single frequency transducer
Performance features: Depth Control Gain(DCG) for detailed bottom and structure views; adjustable range, gain and zoo,; 3-level fish ID; graphic whiteline provides clear image of bottom hardness and structure; See-Thru technology separates fish returns from thermoclines and structure
Alarms: Shallow water, fish by size, anchor drift, timer, temperature, and low battery voltage
Transducers: Choice of single or dual frequency transom-mount transducers. Also available without transducer