Garmin GPSMAP 276C Manual

The Garmin GPSMAP 276C is a rugged, waterproof marine GPS chartplotter with a 5-inch color TFT display, built-in worldwide basemap, support for BlueChart and MapSource cartography, NMEA 0183 interface, external antenna capability, and PC connectivity via serial/USB. It features trip planning, track logging, waypoint management, MOB (Man Overboard) function, and sunlight-readable display. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 5-inch color TFT display, Waterproof case (IPX7), Power/data cable, External antenna connector, PC interface port, Mounting bracket.

Installation

Unpack and inspect contents. Choose mounting location with clear view of sky.

1. Mount unit: Use included bracket; secure to dashboard or console using appropriate hardware.
2. Connect power: Attach red wire to positive (+), black wire to negative (-) on 10-40 VDC source.
3. Connect antenna: Attach external GPS antenna to MCX connector if needed for better reception.
4. Connect to PC: Use serial or USB cable (with adapter) for data transfer and software updates.
5. Secure all cables and protect from moisture and abrasion.

WARNING! Ensure power is off during installation. Route cables away from moving parts and heat sources.

First-Time Setup

Power on unit; follow initial prompts.

1. Acquire satellites: Place unit outdoors with clear sky view; wait for GPS fix (may take several minutes).
2. Set language: In Main Menu > Setup > System, select language (default ENGLISH).
3. Set units: Configure nautical, statute, or metric units for distance, speed, depth, etc.
4. Calibrate compass (if equipped): Follow on-screen instructions.
5. Load maps: Install BlueChart or other Garmin cartography via PC interface.

CAUTION! Do not operate while driving/vessel underway during initial setup.

Specifications

• Display Size: 5 inches diagonal.
• Display Type: 256-color TFT, transflective.
• Waterproof: IPX7 standard.
• GPS Receiver: 12 parallel channel, WAAS enabled.
• Waypoints: 3,000 with name and symbol.
• Routes: 50 reversible routes with up to 250 points each.
• Tracks: 10,000 points, 20 saved tracks.
• Interface: NMEA 0183, RS-232, USB.
• Power: 10-40 VDC, 1.5 W typical.
• Operating Temp: -15° to 70°C (5° to 158°F).
• Dimensions: 6.3" W x 3.7" H x 2.5" D (160 x 94 x 64 mm).

Controls and Settings

Access functions via front panel buttons and on-screen menus. Front Panel: POWER, PAGE, ROCKER key (up/down/left/right/ENTER), ZOOM IN/OUT, MARK, MOB.

On-screen Menus: Main Menu provides access to Map, Navigation, Waypoint, Route, Track, Setup pages.

Setup: System (language, units, time), Display (contrast, backlight, colors), Navigation (routing preferences, alarms), Interface (NMEA settings, data transfer). Map: Orientation (North Up, Course Up, Track Up), Detail level, Chart data fields. Navigation: Follow route, navigate to waypoint, proximity waypoints.

Connecting Devices

External Antenna: MCX connector. PC: Serial or USB cable. NMEA 0183: Connect to compatible marine instruments (depth sounder, autopilot, etc.).

1. Turn off power before making connections.
2. Use appropriate cables and connectors; ensure waterproof seals are intact.
3. Configure NMEA sentences in Interface setup menu as required by connected devices.
4. For data transfer to/from PC, use MapSource software or compatible programs.

Tip: Label cables for easy identification. Use dielectric grease on connectors in marine environments.

Navigation & Chartplotting

Supports detailed marine navigation with BlueChart and other maps.

1. View map: Press PAGE to cycle to Map page; use ZOOM to adjust scale.
2. Navigate to waypoint: Select waypoint from list, choose "Go To".
3. Follow route: Activate route from Route list; navigation line appears on map.
4. MOB: Press and hold MOB button to instantly mark current position and begin navigation back to that point.
5. Data fields: Customize map and navigation screens to show speed, course, distance, ETA, etc.
6. Tracks: View track log, save active track, navigate back along track.
7. Alarms: Set anchor drag, arrival, proximity, and other alarms.

WARNING! GPS is an aid to navigation. Always use traditional navigation methods and maintain proper lookout.

Waypoints & Routes

Create and manage waypoints and routes for trip planning.

1. Mark waypoint: Press MARK at current location; edit name, symbol, coordinates.
2. Create waypoint: From map, move cursor to desired location and press ENTER to create.
3. Build route: In Route menu, select "New", add waypoints in sequence.
4. Edit route: Insert, delete, or reverse waypoints in existing route.
5. Navigate route: Select route and choose "Navigate".
6. Transfer waypoints/routes: Use PC interface to backup or share data.

Tip: Use meaningful waypoint names (e.g., "BUOY14", "HARBENT") for easy identification.

Care & Maintenance

Use fresh water and mild soap to clean exterior; dry thoroughly. Avoid harsh chemicals, solvents, or abrasives.

CAUTION! Do not open unit; no user-serviceable parts inside. Keep connectors clean and protected when not in use. Store in cool, dry place.

Regulatory Information

FCC Part 15: Class B digital device; complies with limits for marine use. CE certified. This device complies with Part 15 of FCC Rules. Operation subject to conditions: (1) device may not cause harmful interference, (2) device must accept any interference received. Copyright © Garmin Ltd. or its subsidiaries. Garmin, GPSMAP, and BlueChart are trademarks of Garmin Ltd. For support, visit www.garmin.com or contact Garmin Product Support.

Troubleshooting

Reset: Main Menu > Setup > System > Reset (options: Reset Settings, Clear All Data).

Service: Contact Garmin Product Support or authorized service center. Do not attempt to repair yourself.