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Garmin GPSMAP 840xs Review

Garmin GPSMAP 840xs has an average rating of 3 out of 5 based on 2 user reviews.



GPSMAP 840xs is a part of the new series of fishfinders from Garmin that support down imaging as well as side imaging (Garmin branded those technologies as DownVü and SideVü). Down imaging is built-in while side imaging requires a GCV 10 module that is sold separately. The 840xs has an 8 inch keyed display and comes preloaded with BlueChart G2 coastal maps as well U.S. LakeVü maps. There is also 8 inch 820xs that doesn’t have BlueChart and LakeVü and 10 inch display versions – 1040xs and 1020xs, with and without maps.

Garmin GPSMAP 840xs comes with a 500W, dual beam 77/200 kHz, transom-mounted transducer that supports traditional broadband sonar, CHIRP and DownVü. 600W CHIRP transducers and 1000W 50/200 kHz dual frequency transducers are also supported and can be purchased separately. CHIRP will give you the most detailed, crystal clear output even at higher speeds. You can suppress sonar noise to achieve remarkable target resolution while reaching greater depth. The 840xs has a maximum depth of 1750 feet with the 500W Garmin dual frequency transducer, and a depth of 2700 feet with the 1kW Airmar B260 transducer.

The included LakeVü cartography contains 17,000 U.S. lakes. The GPS refresh rate is 10 kHZ which results in virtually fluid display. The 840xs is Garmin Radar compatible. The NMEA 2000 support offered by the 840xs allows the user to connect it to other devices such as autopilot or SiriusXM Weather radar, keeping you up to date on rapidly changing conditions. While pricy at $1500, the GPSMAP 840xs includes a lot of bang for the buck. Anyone interested in the unit can expect to see it on the market in February of 2014. You can get a great deal on Garmin GPSMAP 840xs here.

 Lowrance HDS-7 Touch InsightHumminbird 999ci HD SIGarmin GPSMAP 840xs
Screen Size7 in8 in8 in
Screen Resolution480 x 800 pixels480 x 800 pixels600 x 800 pixels
Display TypeWidescreen, 16:9 ; WVGA color TFT LCD16:9 Colorcolor SVGA
Imaging2D, DownScan, StructureScan, Downscan Overlay2D, Down Imaging, Side Imaging2D, Down Imaging (Side Imaging available with GVC box sold separately)
Transducer TypeTransom Mount/Trolling MotorTransom Mount/Trolling MotorTransom Mount/Trolling Motor
Transmit Power31W Broadband RMS (analog equivalent 3200W)
250W Broadband Peak-to-Peak (analog equivalent 30,000W)
1000W RMS
8000W Peak-to-Peak
1 kW traditional
Sonar Frequency(50/200 or 83/200 kHz) + 455/800 kHz83/200 kHz 2D
455/800 kHz Side Imaging
77/200 kHz 2D
Also supports 50/200 dual frequency transducers
Maximum Depth5000 ft / 1524 m1500 ft 2D
150 ft Side Imaging
1,750 ft @ 50 kHz, saltwater, Garmin dual freq transducer @ 500 W

2,700 ft @ 50 kHz, saltwater, Airmar B260 transducer @ 1000 W
GPS Antenna TypeInternal, high-sensitivity GPS+WAASInternalInternal
Waypoint Storage50003000500
Plot Trails10 tracks, 12,000 points50 tracks, 20,000 points50 tracks, 50,000 points
Default MapsExpanded U.S. BaseMap or Insight USAHumminbird ContourXDU.S. LakeVu and BlueChart g2 coastal maps

User Reviews

Posted by Capt. Fred

  • 5/5

What I like the most about this unit is setting waypoints and tracks. You can them without having to jump through many menus and submenus like other units. The GPS and the sonar are also very accurate and quick. I’m a guide so having a solid unit is very important for me. It was a good investment.

Posted by Outdated

  • 1/5

These units are out dated. Garmin is moving to all touch screen GUI and the software and updates are not there for non-touch units

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