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 each) 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 parallel channel 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 the 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 sounder = 14 watts

Physical

Size: 4.9”H x 6.3”W x 2.8”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 zoom; 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

Specifications are subject to change without notice.