Garmin GPSMAP 172C Manual

The Garmin GPSMAP 172C is a 7-inch color chartplotter/fishfinder combo with built-in worldwide basemap, high-sensitivity GPS receiver, sunlight-readable color TFT display, dual-frequency sonar (50/200 kHz), NMEA 0183 and NMEA 2000 connectivity, SD card slot for chart data, and waterproof design (IPX7). Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 7-inch Color TFT Display, Power/Data Cable, Transducer, Mounting Bracket, Hardware, Protective Cover.

Installation

Unpack and inspect contents. Choose mounting location carefully.

1. Mount the bracket: Select a location with clear view of sky and easy access. Use included hardware to secure bracket.
2. Route cables: Run power/data cable and transducer cable to unit, avoiding sharp bends and heat sources.
3. Connect power: Connect red wire to positive (+), black wire to negative (-) on 10-35V DC power source. Install inline fuse.
4. Mount transducer: Follow instructions for transom, thru-hull, or in-hull installation based on boat type.
5. Secure unit: Slide unit onto bracket and tighten locking knob.

WARNING! Ensure all power is OFF during installation. Drill holes carefully to avoid damaging hull integrity.

First-Time Setup

Power on unit; follow initial setup prompts.

1. Acquire GPS signal: Place unit in open sky view. Allow several minutes for first satellite acquisition.
2. Set language: From MAIN MENU > SETUP > SYSTEM, select language (default ENGLISH).
3. Set units: Configure nautical/statute miles, feet/fathoms, temperature (C/F), time format.
4. Calibrate compass (if applicable): Follow on-screen instructions for electronic compass calibration.
5. Configure sonar: Set frequency, sensitivity, and noise filters for your fishing environment.

CAUTION! Do not power unit without proper voltage (10-35V DC). Ensure waterproof seals are intact.

Specifications

• Display Size: 7 inches diagonal, color TFT.
• Display Resolution: 480 x 640 pixels VGA.
• GPS: High-sensitivity receiver, WAAS/EGNOS capable.
• Sonar: Dual-frequency (50/200 kHz), 500W RMS, depth capability to 2500 ft (762 m).
• Waypoints/Routes/Tracks: 3000 waypoints, 50 routes, 10,000 track points.
• Power Input: 10-35V DC, 1.5A max.
• Waterproof: IPX7 standard.
• Operating Temp: -15°C to 55°C (5°F to 131°F).
• Storage Temp: -40°C to 85°C (-40°F to 185°F).

Controls and Settings

Access menus via PAGE and MENU keys. Front Panel: POWER, PAGE, ZOOM IN/OUT, ENTER/MARK, Cursor Pad (UP/DOWN/LEFT/RIGHT).

Main Pages: Chart, Sonar, Highway, Compass, Active Route, Data, Menu.

Chart Settings: Detail, Orientation (North Up/Course Up/Head Up), Color Scheme, Tides, Currents. Sonar Settings: Frequency, Sensitivity, Colorline, Noise Reject, Surface Clarity. System Settings: Language, Units, Time, Backlight, Alarms, NMEA Interface. Navigation Settings: Route Planning, Waypoint Management, Track Log.

Connecting Devices

NMEA 0183: Connect to compatible devices (autopilot, VHF radio) via dedicated wires. NMEA 2000: Connect to compatible network using appropriate cable and tee. SD Card: Insert chart or data card into slot on side.

1. Turn off unit and connected devices before making connections.
2. Match NMEA wires correctly (TX/RX, Ground). Refer to wiring diagram.
3. For NMEA 2000, ensure proper termination and power on backbone.
4. Insert SD card with label facing up until it clicks.

Tip: Use marine-grade heat-shrink connectors and seal all external connections.

Using GPS & Charts

Supports built-in basemap and detailed BlueChart g2 Vision cards.

1. View Chart: Press PAGE to reach Chart page. Use ZOOM keys to adjust detail.
2. Create Waypoint: Move cursor to location, press ENTER/MARK, confirm.
3. Navigate to Waypoint: From WAYPOINTS list, select waypoint, choose "Go To".
4. Create Route: MENU > Route Planner > New Route. Add waypoints in sequence.
5. Follow Route: Activate route from ROUTES list. Follow course line and data fields.
6. Use Tracks: Enable track log to record path. Can be saved and reversed for navigation.
7. Chart Details: Access tide stations, marina info, and points of interest by selecting on chart.

WARNING! GPS is an aid to navigation. Always use updated charts and maintain proper lookout.

Using Sonar

Dual-frequency sonar for fishfinding and depth sounding.

1. Select Sonar Page: Press PAGE to cycle to Sonar page.
2. Adjust Frequency: MENU > Sonar Setup > Frequency. Choose 50 kHz for deep water wide view, 200 kHz for detailed shallow water.
3. Adjust Sensitivity: Use UP/DOWN keys or menu to optimize echo returns.
4. Identify Fish Arcs: Fish appear as arches. Size indicates relative fish size.
5. Use Zoom: Press ZOOM IN to magnify a depth range.
6. Set Alarms: Configure shallow/deep water alarms, fish alarms from menu.

Note: Sonar performance affected by water conditions, boat speed, and transducer placement.

Care & Maintenance

Disconnect power before cleaning. Use fresh water and mild soap with soft cloth. Do not use harsh chemicals or abrasives.

CAUTION! Ensure protective cover is used when unit is not in use. Check cable seals and connectors periodically for corrosion.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC Rules. Operation subject to conditions: (1) device must not cause harmful interference, (2) device must accept any interference received. This product meets applicable European Union directives. For support, visit www.garmin.com/support or contact Garmin Product Support.

Troubleshooting

Reset: Hold PAGE + POWER while powering on to access system reset options (note: erases user data).

Service: Contact Garmin Product Support or authorized service center. Do not open unit; voids warranty.