Question about Garmin GPSMAP 188 Fish Finder/GPS Receiver

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I have a Garmin 188c GPS sounder. When I start it up it does not seem to boot properly, just says "loading", but isn't booting properly.

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Posted on Jan 02, 2017

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SOURCE: Garmin nuvi 250

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Posted on Jul 14, 2009

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SOURCE: Garmin nuvi 660 goes into

There is a transient diode across the switch. Most likely it's shorted, casuing the symptom as if you were holding down the power switch and never letting go. I've seen and repaired this before.

- Jim

Posted on Sep 30, 2010

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SOURCE: my garmin gps 178c sounder

I assume your talking about the marine updater. All the steps are located here:
If you have any other questions let me know.
thank you,

Posted on Oct 10, 2010

GPSCity Mike
  • 464 Answers

SOURCE: My Garmin GPS Nuvi 1300


The nuvi 1xxx series had a firmware issue on some of there released units, the only way to fix this is by giving the unit a firmware update using Garmins Webupdater Software. here is a link to the soft ware needed,

Hope this helps!

Posted on May 10, 2011

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Hi, i have a garmin 820xsgpsmap in my boat and i recently put a blackbox in with a downvu, sidevu tranducer on transom and when useing the unit it dosnt have the option of useing sidvu. Why is this?

I can't remember correct setup but make sure that box is powered and connected to GPS in right input. With no power to box it won't be discovered by head unit.

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How to reset garmin gpsmap 188c

To perform the master reset, please follow these instructions:
  1. With the device powered OFF, press and hold the Quit button
  2. While holding the Quit button, press and hold the Power button
  3. Continue to hold both buttons until the message "Do you really want to erase all user settings?" appears, then release both buttons
  4. Highlight Yes and press the Enter button
The device will now restart. When it fully boots, the device will be set back to factory default settings.

Jun 06, 2016 | Garmin GPSMAP 188 Fish Finder/GPS Receiver

1 Answer

How can i fix,nuvi only shows garmin logo when turned on

This is a booting problem. Please see this video that we have made that will explain why it happens and how to get the problem resolved. Garmin GPS Booting Problems By SHARCNET USA

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Garmin GPSMAP 178C not boot

can we download india map?if tell me how to download and install the map in my device Gm4300?

Nov 20, 2013 | Garmin GPSMAP 178C Sounder GPS Receiver

1 Answer

Garmin 1450 LMT Not loading past Garmin logo

The USB will not be recognized until the unit boots to the main screen. This is where the subroutine scans for the insertion of the USB cable. In order to fix this problem, you have to access the flash drive directly, bypassing the standard boot-up. The drive must be properly formatted, otherwise the Nuvi can not write to the flash drive on boot-up and will either go into a boot-up loop or stay stuck at the Garmin logo. Accessing the flash drive must be accomplished in pre-boot mode. there are several programs out there that can do this. Once the drive is properly formatted, the unit will boot, create the Garmin folder, write a few other folders and files and boot-to the main menu. Now, you can connect the cable as usual and start copying over your backed up files. I've repaired this issue many times.

More info can be found here:

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Garmin GPS 168 Sounder

screen got stepped on while fishing on front of boat and need to find someone who can repair the unit. Thanks for any advice..

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Won't boot up

I have a same problem, and I think I can fix it, may be not. Any how, I bought a cornice drive on eBay and as soon I will get it. I will load my maps on to it with usb connector after that I take it a part and remove it from its case. Then I will take my Garmin Streetpilot 2620 apart remove the old cornice drive and install the new drive. I suspect it will work like a charm. To check your GPS at boot push and hold "menu-find" buttons simultaneously and you will get a screen to verify your problematic cornice drive.59c5167.jpg

Jan 24, 2008 | Garmin StreetPilot 2620 GPS Receiver

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