Garmin GPSMAP 498 Manual

The Garmin GPSMAP 498 is a high-performance marine chartplotter featuring a sunlight-readable color display, preloaded BlueChart g2 coastal charts, built-in GPS receiver, sonar capability (when connected to a compatible transducer), and rugged waterproof construction. Ideal for offshore and coastal navigation, it supports waypoint management, route planning, track recording, and integration with various marine networks. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: Sunlight-readable color TFT display, Waterproof case (IPX7), Built-in GPS antenna, SD card slot, NMEA 0183/NMEA 2000 connectivity, Transducer input for sonar.

Installation

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

1. Mount the unit: Use provided bracket or flush mount kit. Ensure secure attachment to helm or console.
2. Connect power: Route power cable to battery. Connect red wire to positive (+), black wire to negative (-). Use in-line fuse as specified.
3. Connect transducer (optional): Route cable to transom or through-hull location. Connect to sonar port.
4. Connect to marine network (optional): Wire NMEA 0183 leads to compatible devices or connect to NMEA 2000 network.
5. Secure all cables with cable ties and protect from abrasion.

WARNING! Disconnect power before installation. Ensure all connections are waterproofed. Route cables away from moving parts and heat sources.

First-Time Setup

Apply power to the unit; follow initial startup prompts.

1. Acquire GPS signal: Place unit in open sky view. Allow several minutes for initial satellite acquisition.
2. Set language and units: Navigate to Main Menu > Setup > System to select language, distance, speed, and depth units.
3. Calibrate compass (if applicable): Follow on-screen instructions for magnetic compass calibration.
4. Adjust display: Set backlight, contrast, and color scheme for optimal visibility.
5. Configure alarms: Set anchor drag, arrival, and off-course alarms as needed.

CAUTION! Ensure proper ventilation around unit. Do not mount in direct sunlight if possible to prevent overheating.

Specifications

• Display: 5" diagonal, 480 x 640 pixels, 256-color TFT.
• GPS: High-sensitivity receiver, WAAS/EGNOS enabled.
• Charting: Preloaded BlueChart g2, supports detailed coastal charts.
• Sonar: Dual-frequency (50/200 kHz) capable, depth to 3000 ft (915 m).
• Power: 10-32 V DC, 1.5 A typical.
• Waterproof: IPX7 standard.
• Interface: NMEA 0183 (2 inputs, 1 output), NMEA 2000, SD card slot.
• Operating Temp: -15° to 70°C (5° to 158°F).
• Dimensions: 6.3" W x 4.2" H x 2.8" D (160 x 107 x 71 mm).

Controls and Settings

Access functions via front panel keys and rotary knob. Power key turns unit on/off. PAGE cycles through display pages (Chart, Sonar, Highway, etc.). MENU accesses context-sensitive options.

Main Menu Categories: Chart, Sonar, Waypoints, Routes, Tracks, Setup, Information.

Chart Settings: Orientation (North Up, Course Up, Head Up), Detail level, Shallow/Deep water alarms. Sonar Settings: Frequency, Sensitivity, Range, Noise rejection. System Setup: Units, Time, Alarms, Backlight, NMEA configuration. Navigation: Waypoint creation/edit, Route planning, Track recording and management.

Connecting Devices

Power: Direct to battery with in-line fuse. Transducer: To sonar port. NMEA 0183: Connect to compatible devices (AIS, autopilot, etc.). NMEA 2000: Connect to certified backbone for data sharing.

1. Turn off all devices before making connections.
2. Use marine-grade connectors and seal against moisture.
3. For NMEA 0183, match transmit (TX) to receive (RX) lines between devices.
4. For NMEA 2000, ensure proper termination and power on the network.

Tip: Label all cables during installation for easier future maintenance.

Using Navigation Features

Supports waypoint, route, and track navigation.

1. Create Waypoint: Press MARK at current location or use cursor to select point on chart.
2. Navigate to Waypoint: From waypoint list, select and choose "Go To".
3. Create Route: Menu > Routes > New Route. Add waypoints in sequence.
4. Follow Route: Select route and choose "Navigate".
5. Record Track: Tracks are automatically recorded. Access via Tracks menu to save, clear, or navigate back.
6. Use Chart: Zoom in/out with IN/OUT keys. Pan map with cursor control.
7. Access Chart Information: Select objects on chart for details like buoy characteristics, depth contours.

WARNING! Always verify chart data and GPS position against visual references and other navigation aids. This device is an aid to navigation only.

Sonar Operation

When a transducer is connected, the unit displays depth, water temperature, and fish arches.

1. Switch to Sonar page: Press PAGE until Sonar display appears.
2. Adjust settings: Use MENU to set frequency, range, sensitivity, and noise filters.
3. Interpret display: Bottom appears as a solid line. Fish may appear as arches. Structure shows as irregular shapes.
4. Use Zoom: Zoom in on a portion of the water column for detailed view.
5. Set Alarms: Configure shallow/deep water and fish alarms.

Note: Sonar performance depends on transducer installation, water conditions, and boat speed.

Care & Cleaning

Disconnect power before cleaning. Use a soft, damp cloth with mild soap solution. Do not use abrasive cleaners or solvents.

CAUTION! Ensure connectors and seals are free of debris. Do not spray water directly onto connectors. Store in a dry place when not in use for extended periods.

Regulatory Information

FCC Compliance: This device complies with Part 15 of the FCC Rules. Operation is subject to conditions that it does not cause harmful interference. Contains FCC ID: IPH-00216A. IC: 1792A-00216A. Copyright © Garmin Ltd. or its subsidiaries. BlueChart and GPSMAP are trademarks of Garmin Ltd. For support, visit www.garmin.com/support or contact Garmin Product Support.

Troubleshooting

Reset: To perform a master reset, power off. Press and hold PAGE + POWER while powering on (consult advanced manual).

Service: Contact Garmin Product Support or visit www.garmin.com for warranty and repair information.