Question about Garmin Colorado 300 Handheld GPS Receiver

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I have deleted pre loaded maps in my gps colorado 300. How do I reset.

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If the maps are deleted they are gone! Contact Garmin and ask them to replace the maps. There is no way of resetting deleted maps.

Posted on Jun 14, 2009


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Garmin Colorado 300 not turn on


Put a fresh set of batteries in it.
Connect it to a computer and run the Garmin WebUpdater program to load or reload the latest software.
You may also want to contact Garmin Tech Support for assistance.

Feb 22, 2012 | Garmin Colorado 300 Handheld GPS Receiver

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How do i reset my garmin colorado 300

First you'll also need to download file below. Once you've downloaded this file unzip it into a directory such as C:\Garmin on your PC.

On your PC click the Start menu, select "Run..." and type "cmd" where it says open. A black window with a DOS command prompt should appear. At the command prompt enter the following command:

> cd c:\Garmin
At the next command prompt type the following command without hitting enter:

> Updater.exe 066101000230.rgn
Now back to your GPS.

Press and hold the "up button" on the Rock'n Roller while you plug the CO into the USB cable. Wait 10-20 seconds while still holding the "up button". You should see a Garmin banner and nothing else. At this point you can hit enter on your PC to execute the updater command. Once the updater runs you will need to select you Colorado under USB and hit enter. This should perform the update (you may get a warning about loading an older version of software). You should receive a message that the update was successful and the Colorado will reboot.

Once the reboot is complete the "Loader" banner should appear near the top of the CO screen after about 30 seconds. Release the "up button" and on your PC you should be able to see the Colorado as a USB drive.

You can now attempt to fix the files on your Colorado which are preventing it from starting. If you've recently added or changed files these are good places to start. Deleting gpx files and/or replacing map img files with your backup copies may resolve the issue as well.

May 07, 2011 | Garmin Colorado 300 Handheld GPS Receiver

1 Answer

I turn my Colorado 300 on, it starts, but dies while loading maps. Like the batteries were out, but they are new.

Hi, It seems to be backup battery on PCB. You have to replace it. It is very frequent defect for CO which was made, same battery there were used by Garmin was defect - shorter life time. Jean

Sep 11, 2010 | Garmin Colorado 300 Handheld GPS Receiver

2 Answers

No maps on the gps

most gps systems come with a memory card that you have to load the maps onto from a cd that is either supplied or can be purchased separately. or in some cases the memory card is pre-loaded with maps and just requires you to insert it into the memory card slot.

Jul 11, 2009 | Nextar X3 GPS Receiver

1 Answer

Collerado 300 arrow facing wrong way

Have you tried to calibrate the compass? I find that this has to be done almost evry time I use the GPS. Also make sure the map is oriented with the heading up


Jan 18, 2009 | Garmin Colorado 300 Handheld GPS Receiver

2 Answers

530 hcx

You need to select all the segments at the same time and then transfer to the GPSr. Do not send one set, then another as the second set will overwrite the first set.

Feb 20, 2008 | Garmin Rino 530 GPS Receiver

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