Garmin GPSMAP 521s Sounder with Dual Frequency Transducer

Tutorial Videos

Questions and Answers (Q&As)

Popular Accessories

What's Included In The Box?

• Garmin GPSMAP 521s Sounder with Dual Frequency Transducer
• Garmin Dual Freq Transducer Depth Temp Plastic Kit (View this item)
• Garmin GPSMAP 420 and 430 Power and Data Cable (View this item)
• Garmin GPSMAP 520 and 530 Cover (View this item)
• Garmin GPSMAP 520 530 Marine Swivel Mount (View this item)
• Documentation

Product Information

User Manual

Gallery of Customer Images

Customer Reviews

Family Series

Alternative Models

Manufacturer Description

The GPSMAP 521 is a compact chartplotter that features an ultra-bright 5” QVGA color display along with an improved high-speed digital design for increased map drawing and panning speeds. It's ready to go with a built-in, satellite-enhanced worldwide basemap and an easy-to-use interface designed to help you navigate the open waters with ease. The GPSMAP 521 also accepts BlueChart® g2 Vision cards for added features and functionality such as high-resolution satellite imagery, 3D views and Auto Guidance technology.

View Satellite-enhanced Worldwide Basemap

The GPSMAP 521 basemap contains worldwide satellite images in place of traditional maps. The GPSMAP 521 also comes standard with a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times. In addition, the GPSMAP 521 can receive U.S. graphical weather data via optional GXM 51 satellite receiver/antenna. And with an SD card slot, it's easy to add additional maps without connecting to a computer.

Add Sonar

Where applicable, the sounder version, GPSMAP 521s, comes with a powerful dual-frequency transducer that clearly illustrates depth contours, fish targets and structures whether you're fishing in freshwater or off the coast. The GPSMAP 521 and GPSMAP 521s are also NMEA 2000-certified for easy connectivity with sensors, instruments and future marine offerings.

Add Extras with BlueChart g2 Vision

• 3D Mariner's and Fish Eye view provides you with a 3-dimensional perspective of map information, both above and below the waterline
• High-resolution satellite images and aerial photographs help you orient yourself in unfamiliar areas
• Auto Guidance technology searches through all relevant charts to create a route you can actually follow - one that avoids obstacles, shallow water, buoys and other obstructions

Features and Tips

GPSMAP 521s Sounder with Dual Frequency Transducer features

• Garmin radar compatible: no
• Garmin sonar compatible: yes
• CANet® compatible: no
• Garmin Marine Network™ compatible: no
• Touchscreen: no
• Supports AIS (tracks target ships' position): yes
• Supports DSC (displays position data from DSC capable VHF radio): yes
• Audible alarms: yes
• Tide tables: yes
• Hunt/fish calendar: no
• Sun and moon information: yes
• 3-D map view: yes (with optional BlueChart g2 Vision card)
• Auto Guidance: yes (with optional BlueChart g2 Vision card)
• Automatic routing (turn by turn routing on roads): no
• XM WX Weather & Radio for U.S. compatible: yes
• Voice prompts (e.g. "Turn right in 500 ft."): no
• Speaks street names (e.g. "Turn right ON ELM STREET in 500 ft."): no
• Remote control: no
• Headphone jack/audio line-out: no
• Audio/video input/output: no
• Portable: no
• Automotive/motorcycle-friendly: no

Unit dimensions, WxHxD: 5.9" x 6.4" x 2.9" (15.0 x 16.3 x 7.4 cm)
• Display size, WxH: 3.0" x 4.0", 5.0" diagonal (7.6 x 10.2 cm, 12.7 cm diagonal)
• Display resolution, WxH: 234 x 320 pixels
• Display type: QVGA display
• Weight: less than 1.75 lb (0.8 kg)
• Battery: none
• Battery life: none
• Waterproof: yes (IPX7)
• High-sensitivity receiver: yes
• Antenna: internal
• NMEA input/output: NMEA 0183 compatible and NMEA 2000 certified

• Basemap: yes
• Preloaded maps: no
• Ability to add maps: yes
• Built-in memory: none (cannot load maps to internal memory)
• Accepts data cards: SD™ card slot
• Waypoints/favorites/locations: 3,000
• Routes: 100
• Track log: 10,000 points; 50 saved tracks

Specifications