Question about Garmin GPSMAP 172C GPS Receiver

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Display won't come up anymore

I have used my Garmin GPSMap 172C for a few months now. The display starting getting weak on my boat. Today I plugged it to my AC converter and adapter at home. The keys light up but the display is completely dark. What should I do?
Thanks for the help

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  • newcal Jun 16, 2008

    Man, you are absolutely right!.....I had inadvertently changed the luminosity with the off button!

    Thanks a mil.....avoided me a ton of hassle.




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  • 174 Answers

The power switch usually allows you to adjust the backlight with a short tap there should be a scroll bar, use the four way toggle up to increase the back light.

Posted on Jun 16, 2008


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1 Answer

How to degausse gpsmap 172 gps

Hi Donnie,

Degaussing is not something that ever needs to be done on this device.

Degaussing is a term that I learned many years ago - it was a process performed periodically on early CRT (cathode ray tube) displays (such as a TV). Over time, CRT displays would build up magnetic charges that would cause the image to become distorted. A degaussing wand would be connected to an AC outlet and then brought very close to the display and gradually withdrawn. This would neutralize the magnetic charges on the display - and the resulting distortion. Years later, manufacturers incorporated a degaussing coil inside the display's cabinet that did the same job as the degaussing wand - thereby making the wand obsolete.

The GPSMap 172 has an LCD display that requires an electrical charge to create an image on the display. Unlike a traditional CRT type displays, an LCD (or LED for that matter) display is unaffected by magnets / magentism. Hold a magnet near a non-CRT type display to see for yourself. A magnet held near a CRT display however will distort the image more as it gets closer to the display. Caution: Doing this may cause PERMANENT damage to the CRT display. This is why many home theater speaker systems touted that fact that they were "magnetically shielded" so that they would not distort the images on the CRT display.

I hope this helps!

Aug 28, 2013 | Garmin GPSMAP 172C GPS Receiver

1 Answer

Cant get xm weather on garmin 740s

To receive XM weather or audio, the GPSMAP 740s requires a GXM 40 Smart Antenna with XM subscription.

The GXM 40 Smart Antenna (010-00730-00) is used to receive weather and audio service from XM satellite radio. For details on XM services please visit our XM webpage.

Once a GXM 40 Smart Antenna has been connected to the GPSMAP 640, the device can display the subscription information for the antenna.

From the Home Page in Boating mode:

  1. Select Configure
  2. Select System
  3. Select System Information
  4. Choose Weather Subscription

From the Home Page in Driving mode:

  1. Select Tools
  2. Select XM Services
  3. Select XM Radio
  4. Set the channel selector to channel 0
  5. Select Radio ID

The subscription information will now be displayed on the screen.

Mar 26, 2011 | Garmin Gxm 51 Weather And Audio Xm...

1 Answer

Garmin GPSMAP 172C - cannot find satellites (WAAS)?

WAAS is a seperate service from GPS. It provides GPS corrections so if you can not get WAAS there is no big problems. you unit just wont be as accurate as normal. WAAS only is for North America and EGNOS for Europe. You may want to turn WAAS off for now. I suggest trying a update for the unit. You will need a memory card and Garmin USB programmer. Then just go to garmins site to get the latest update. If you need a USB programmer feel free to Contact or They are the leading experts in Garmin GPS.

Jul 12, 2010 | Garmin GPSMAP 172C GPS Receiver

1 Answer

GPSMap 172c Can not read Garmin Data Card

I have the Sounder 178C. It will only work with 128 Mb Cards (or smaller). It does not work with the 256Mb Cards - says "Reading Card" forever.

Per Gramin, I had to buy the 128 Mb card and DVD map update. Then program the card with a USB data programmer to make it work.

May 01, 2009 | Garmin GPSMAP 172C GPS Receiver

1 Answer

Unit shuts off after a minute or so

i have the same problem. i just read that it maybe a software rather than a hardware problem. updating the firmware will "Fix bug on Data Card Information page to prevent unit shutdown"

...trying to locate a pc interface cable to install...

Mar 28, 2009 | Garmin GPSMAP 172C GPS Receiver

1 Answer

Antenna input shorted

contact garmin sounds like a defective unit

Mar 10, 2009 | Garmin GPSMAP 172C GPS Receiver

1 Answer

No satelite acquisition for garmin 172c

you need to go outside in an open area with no trees around and turn the garmin on untill it receives a sat connection it can take several minutes for it to find it

Dec 04, 2008 | Garmin GPSMAP 172C GPS Receiver

2 Answers

172 will not work after dropping

Have you solved the problem?
If not you shall check that the flexible cable to the screen is securely connected to the circuit board. Check also the other cables.

Oct 21, 2007 | Garmin GPSMAP 172 GPS Receiver

1 Answer

Depth display

reset your factory settings!

Oct 02, 2007 | Garmin GPSMAP 498

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