Garmin GPSMAP 740s User Manual

The Garmin GPSMAP 740s is a 7-inch high-brightness chartplotter with built-in BlueChart g2 and U.S. LakeVu HD maps, integrated GPS and GLONASS receiver, CHIRP traditional sonar, CHIRP ClearVü scanning sonar, CHIRP SideVü scanning sonar, NMEA 2000 and NMEA 0183 support, built-in Wi-Fi for ActiveCaptain, and Garmin Marine Network compatibility. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

Features at a Glance

Key components: 7-inch sunlight-readable display, Power/data cable, Mounting hardware, Protective cover, Documentation.

Installation

Unpack and inspect contents. Choose a suitable mounting location with clear view and access.

1. Mount the bracket: Use provided hardware to secure bracket to helm or console.
2. Route cables: Plan cable path avoiding sharp edges and heat sources.
3. Connect power: Connect red wire to positive (+), black wire to negative (-) on boat's 10–35 Vdc system.
4. Connect network: Attach Garmin Marine Network cable to other compatible devices if needed.
5. Connect sonar: Attach transducer cable to appropriate port.
6. Secure device: Snap chartplotter into mounted bracket.

WARNING! Ensure all connections are secure and protected from moisture. Disconnect power before installation.

First-Time Setup

Power on device; follow on-screen prompts.

1. Language and Region: Select preferred language and boating region.
2. Agree to terms: Read and accept software license agreement.
3. Configure settings: Set units (nautical/statute), time format, and alarms.
4. Connect to Wi-Fi: Go to Settings > Wi-Fi to connect to ActiveCaptain app.
5. Calibrate compass: Follow on-screen instructions if external sensor is connected.
6. Update software: Use ActiveCaptain to check for and install latest updates.

CAUTION! Ensure proper ventilation around device. Do not mount in direct engine exhaust path.

Specifications

• Display Size: 7 inches diagonal.
• Display Resolution: 800 x 480 pixels.
• Waterproof Rating: IPX7.
• Power Input: 10–35 Vdc.
• Internal Memory: For software and user data.
• Sonar Frequency: Traditional: 50/77/83/200 kHz; ClearVü/SideVü: 260/455/800 kHz.
• GPS/GLONASS: High-sensitivity receiver with WAAS/EGNOS support.
• Wireless: Built-in Wi-Fi (802.11b/g/n).
• Operating Temp: -15° to 55°C (5° to 131°F).
• Storage Temp: -40° to 70°C (-40° to 158°F).

Controls and Settings

Access menus via touchscreen. Physical buttons: Power, Volume Up/Down.

Home Screen: Provides quick access to Navigation, Sonar, Media, and Settings.

Settings: System (Language, Units, Time), Navigation (Routing, Alarms), Sonar (Frequency, Range, Gain), Network (Device List, NMEA 2000), Communications (Wi-Fi, Bluetooth).

Sonar Views: Traditional, ClearVü (downward view), SideVü (sideways view).

Chart Settings: Detail, Orientation (North Up, Course Up, Head Up), Overlays (Depth, Waypoints, Tides).

Connecting Devices

NMEA 2000: Connect to boat's NMEA 2000 network for engine data, wind, depth, etc. NMEA 0183: Connect for compatibility with older devices. Transducer: Connect compatible Garmin transducer for sonar. Garmin Marine Network: Connect to other Garmin plotters, radars, or sounders. Wi-Fi: Connect to smartphone/tablet for ActiveCaptain.

1. Turn off power before connecting devices.
2. Use appropriate Garmin cables and connectors.
3. Verify connections in Settings > Network > Device List.

Tip: Use dielectric grease on connectors for corrosion protection in marine environments.

Using Charts & Navigation

Built-in BlueChart g2 and LakeVu HD maps provide detailed coastal and inland coverage.

1. View Chart: From Home, tap Navigation or Chart.
2. Navigate to Waypoint: Tap Where To? > Waypoints, select destination, and Go.
3. Create Route: Tap Where To? > Routes > Create Route, tap points on chart, and Save.
4. Follow Route: Select route from list and Go.
5. Use Tracks: View and navigate saved tracks.
6. Access ActiveCaptain: Connect via Wi-Fi to download community data, dockage info, and software updates.
7. Set Alarms: Configure anchor drag, arrival, and off-course alarms in Navigation settings.

WARNING! Always use up-to-date charts and verify navigation decisions with other sources.

Using Sonar Features

Access sonar from Home screen. Traditional Sonar: For depth and fish arches. ClearVü: For detailed downward view of structure and bottom. SideVü: For detailed sideways view of structure and fish.

1. Select Sonar View: Tap Sonar icon, then choose Traditional, ClearVü, or SideVü.
2. Adjust Settings: Tap screen to access Gain, Range, Frequency, and Palette.
3. Interpret Display: Learn to identify bottom composition, structure, and fish targets.
4. Use A-Scope: Enable for real-time vertical depth column.
5. Split Screen: View multiple sonar frequencies or views simultaneously.

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

Care & Cleaning

Disconnect power before cleaning. Use fresh water and mild soap with soft cloth. Do not use abrasive cleaners or high-pressure water.

CAUTION! Ensure connectors and ports are dry before reconnecting power. Store in protective cover when not in use.

Regulatory Information

FCC Compliance: This device complies with part 15 of the FCC Rules. Operation is subject to conditions: (1) device must not cause harmful interference, (2) device must accept any interference received. Industry Canada (IC): Complies with RSS-210/310. Copyright © Garmin Ltd. or its subsidiaries. BlueChart, ClearVü, SideVü, and GPSMAP are trademarks of Garmin Ltd. For support, visit support.garmin.com or contact your local dealer.

Troubleshooting

Reset: Settings > System > Reset > Reset Settings (Note: This erases user preferences).

Service: Contact Garmin Product Support or authorized dealer. Do not open device; no user-serviceable parts inside.