Garmin GPSMAP 492 Manual

The Garmin GPSMAP 492 is a marine GPS chartplotter featuring a high-resolution color display, preloaded BlueChart g2 coastal charts, built-in worldwide basemap, sonar capability (when connected to a compatible sounder), NMEA 0183 interface support, waterproof design (IPX7), and robust mounting options for marine environments. Below are key sections for safety, features, installation, operation, and troubleshooting.

Features at a Glance

Key components: High-resolution color TFT display, GPS antenna, Power/data cable, Mounting hardware, Protective cover.

Installation

Unpack and inspect contents. Choose mounting location carefully.

1. Select Mounting Location: Choose a flat, sturdy surface with clear view of sky for GPS reception.
2. Mount Unit: Use provided template to drill holes for flush mount or attach bracket.
3. Connect Power: Route power/data cable to 10-35 VDC source. Connect red to positive, black to negative.
4. Connect Antenna: Ensure GPS antenna has clear view of sky (if external antenna is used).
5. Connect Optional Devices: Connect NMEA 0183 devices or sonar module per wiring diagrams.

WARNING! Ensure all power connections are secure and fused. Route cables away from moving parts and heat sources.

First-Time Setup

Power on unit; follow initial prompts.

1. Acquire GPS Signal: Place unit in open area with clear sky view. Acquisition may take several minutes first time.
2. Set Language: Use MENU > Setup > System > Language.
3. Set Units: Configure nautical/miles, depth (feet/fathoms/meters), and coordinate format.
4. Calibrate Compass (if applicable): Follow on-screen instructions if unit has electronic compass.
5. Set Time: Set time zone and format (12/24 hour).

CAUTION! Do not power unit until all connections are verified. Protect from voltage spikes.

Specifications

• Display Size: High-resolution color TFT.
• GPS Receiver: High-sensitivity, WAAS enabled.
• Charts: Preloaded BlueChart g2 coastal charts.
• Waypoints/Routes: 3000 waypoints, 50 reversible routes.
• Track Log: 10,000 points, 20 saved tracks.
• Interface: NMEA 0183, optional sonar input.
• Power: 10-35 VDC, 1.5A max.
• Waterproof: IPX7 standard.
• Operating Temp: -15°C to 70°C.
• Dimensions: Varies by mounting.

Controls and Settings

Access functions via front panel buttons or on-screen menus.

Front Panel: POWER, PAGE, ROCKER key (up/down/left/right/ENTER), MARK, MENU, ZOOM IN/OUT.

Menu Functions: NAVIGATION (Go To, Routes, Tracks), CHARTS (Chart Setup, Overlays), SOUNDER (if connected), SETUP (System, Units, Alarms, NMEA), WAYPOINTS/MARKETS (Create, Manage).

Settings: Display contrast/brightness, backlight timeout, alarm settings (anchor drag, arrival, off-course), navigation preferences (avoidances, calculation method).

Connecting Devices

NMEA 0183 devices: Connect to NMEA IN/OUT wires. Sonar: Connect compatible sounder module.

1. Turn off power before making connections.
2. Refer to wiring diagram for NMEA 0183 connections (TX/RX, ground).
3. For sonar, connect transducer cable to appropriate port.
4. Secure all connections with waterproof sealant if exposed.

Tip: Use marine-grade wire and connectors for all external connections.

Using Navigation Features

Basic navigation functions: Go To, Routes, Tracks.

1. Go To: Select waypoint from list or chart, press ENTER, then select "Go To".
2. Create Route: MENU > Navigation > Routes > Create Route. Add waypoints in sequence.
3. Follow Route: Select route from list, press ENTER, select "Navigate".
4. Track Recording: Automatically records track log. Save track from track log menu.
5. Waypoints: Press MARK to create waypoint at current location. Edit name/symbol via waypoint manager.
6. MOB (Man Overboard): Press and hold MARK button to mark MOB position and begin navigation back.

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

Chartplotter Functions

Chart display and customization.

1. Zoom: Use ZOOM IN/OUT buttons or rocker key.
2. Chart Orientation: North-up or Course-up.
3. Chart Details: Adjust detail level (MENU > Chart Setup).
4. Overlays: Display waypoints, routes, tracks, depth contours, tides.
5. Cursor Mode: Use rocker to move cursor; view coordinates/distance to cursor.
6. Tides & Currents: Access tide station data from chart (if available in chart data).

Care & Maintenance

Use fresh water and mild soap to clean exterior. Do not use harsh chemicals or abrasives.

CAUTION! Ensure power is disconnected before cleaning. Do not spray water directly into connectors. Store in 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 the condition that this device does not cause harmful interference. Copyright © Garmin Ltd. or its subsidiaries. BlueChart and GPSMAP are trademarks of Garmin Ltd. or its subsidiaries. For support, visit www.garmin.com/support or contact Garmin Product Support.

Troubleshooting

Reset: MENU > Setup > System > Reset (options: reset settings, clear memory, master reset).

Service: Contact Garmin Product Support or authorized service center.