Garmin GPSMAP 421 / 421S

View Satellite-enhanced Worldwide Basemap

The GPSMAP 421 basemap contains worldwide satellite images in place of traditional maps. The GPSMAP 421 also comes standard with a high-sensitivity GPS receiver for superior satellite tracking and quicker acquisition times. In addition, the GPSMAP 421 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 421s, 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 421 and GPSMAP 421s are also NMEA 2000-certified for easy connectivity with sensors, instruments and future marine offerings.

Add Extras with BlueChart g2 Vision

With the optional BlueChart g2 Vision SD card, you can add a whole new dimension of exceptional features to your chartplotter.

• 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

What's in the Box:

• GPSMAP 421/421s*
• Tilt/swivel mount
• Protective front cover
• Power/data cable
• Documentation

*Sounder available with and without dual-frequency transducer.

Inland Lakes Vision Continental U.S. SD CARDS	Transducers for GPSMAP 421s (click here)	Fishfinder/Sounder Power/data cable  010-10918-00
g2 Vision Marine Charts	Chartplotter Power/data cable 010-10917-00	Flush mounting kit 010-10447-03
Fishfinder/Sounder Power/data cable  010-10918-00	GFS™ 10 Fuel Sensor   010-00671-00	GA 30 remote Marine Antenna Includes pole/surface/under-deck mount capability with mounting brackets, 30 ft. cable and BNC connector
2nd Mounting station Part Number: 010-10930-00	Marine swivel mounting bracket (replacement) Part Number: 010-10921-00	GXM 51 Delivering U.S. graphical weather data directly to your compatible Garmin chartplotter
GFS™ 10 Fuel Sensor   010-00671-00	XM Cable 010-10919-00	Sun Shade Visor

Physical & Performance:
Unit dimensions, WxHxD:	5.7" x 5.0" x 2.7" (14.5 x 12.7 x 6.9 cm)
Display size, WxH:	2.4" x 3.2", 4.0" diagonal (6.1 x 8.1 cm, 10.2 cm diagonal)
Display resolution, WxH:	240 x 320 pixels
Display type:	QVGA display
Weight:	1.3 lb (590 g)
Battery:	none
Battery life:	none
Waterproof:	yes (IPX7)
High-sensitivity receiver:	yes
Antenna:	internal
NMEA input/output:	NMEA 0183 compatible and NMEA 2000 certified

Maps & Memory:
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

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