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GMI 20 Marine Instrument


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Model # 14681001 | Mfg # 010-01140-00

The GMI™ 20 digital marine instrument display is designed for both power and sail vessels. It clearly shows depth, speed, wind and more than 100 marine and vessel parameters. Its large, bright 4" diagonal color display with anti-glare finish is easy to read from a distance with an ultra-wide 170° viewing angle. A glass-bonded finish lens prevents fogging and increases contrast. Daylight readability is enhanced with a high-contrast color scheme. For enhanced night visibility, you have a choice of red/black, green/black or the normal night mode color scheme along with a dimmer control. Screens can be set to auto-scroll, cycling between pages automatically. This is especially advantageous for sailors, as it allows you to install the unit(s) in a greater variety of locations on the vessel. Default profiles can be customized for powerboat, sailboat, fishing, engine/fuel, plus several other user-specified profiles. Power is supplied by the NMEA 2000 network.

  • Display Type: Glass-bonded, anti-glare color TFT
  • Screen Size: 4"diag.
  • Horiz. Pixels: 320
  • Vert. Pixels: 240
  • Backlight: LED backlight, full color, red/black, green/black
  • Viewing Angle: 170°
  • Functions: Depth, speed, wind, over 100 marine and vessel parameters
  • Controls: Five buttons
  • Width: 4 9/16"
  • Height: 4 5/16"
  • Depth: 1 3/16"
  • Weight: 8.71oz.
  • NMEA Interface: NMEA 2000, NMEA 0183
  • Voltage: 9-32V DC (NMEA 2000 input voltage: 9-16V)
  • Draw: 200mA at 12V
  • Waterproof Rating: IPX7
  • Warranty: One year


In the box:

  • GMI 20*
  • Black trim piece snap cover
  • Protective cover
  • Flush mount gasket and hardware
  • NMEA 2000® T-connector
  • NMEA 2000 drop cable
  • Documentation


GMI 20 Marine Instrument

Dimensions 4 9/16" Width x 4 5/16" Height x 1 3/16" Depth
Display Color Color Display
Display Type Analog
Features Depth
Warranty Details One Year

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by PowerReviews
Garmin GMI 20 Marine Instrument

(based on 2 reviews)

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Reviewed by 2 customers

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We REALLY like this product

By OS2Dude

from Atlanta, GA

Verified Reviewer


  • Good use of display area
  • NMEA 2000 compatable
  • User Configurable


  • As expensive as some small/medium chart readers

Best Uses

    Comments about Garmin GMI 20 Marine Instrument:

    Had an older GMI-10 that I brought with me from an older boat. Bought the GMI-20 because they don't make the GMI-10 any more. Love the display quality and the fact that the user can configure just about any data to be displayed nearly any way they want. You are not locked into a few manufacturer preset screens. Even though my chart reader is SIMRAD, I will buy another GMI-20 for the pedestal and move the GMI-10 to the nav station.

    • Was this a gift?:
    • No

    (0 of 1 customers found this review helpful)


    Pretty sleek display

    By Sup and Sail

    from Bahamas

    Verified Buyer

    Comments about Garmin GMI 20 Marine Instrument:

    Works beautifully so far on my sailing catamaran! Gorgeous display, very sleek looking and displays a lot of info in a small screen easily read. So far so good!

    • Was this a gift?:
    • No

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