Question about Garmin Edge 305 GPS Receiver

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Can't upload data to computer

Everytime I try to upload my ride data to the computer, I get an error.  The GPS resets and the data is lost.  Also, when I power down I have trouble getting it to turn on again.  I have to press power and mode a few times and then power and reset to get it back on.

Bob Downs

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Re: Can't upload data to computer

Summary: Memory of device overloaded.

1 Backup your Training center data under File in program.

2 On the device (using mode button) goto History [enter] go to Running or Biking [enter] click down to delete [enter] select "Keep 1 month " [enter] select yes for confirmation [enter]

3 Reinsert device in USB cradle. Select "Receive from device" under File in program.

4 Download your latest information.

Worked for me.

Posted on Oct 20, 2008

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No map data availble

Your Garmin GPS has an internal memory or an SD-card that contains an "operating system" and "map data".The operating system is like windows or Mac OSX. It contains the menu and everything the GPS displays. The "map data" is a digital roadmap the GPS uses to calculate your route. If the map data was on a SD-card that was inserted in your GPS, it could me that you lost the SD-card. That could be the reason your GPS can't find the map data. Sometimes it happens that when people connect their GPS to a computer to update the "operating system" of the GPS something goes wrong. For example, when you disconnect your GPS from the computer while the update software is still writing data to your device, the connection gets lost and you're left with corrupt files on the GPS. It could also be a defect in the internal memory of the GPS. I suggest you try to update the operating system with a program called "Garmin Express" (just google and easy find it). You need to connect the GPS to your computer with a USB cable. Then you can perform an update. I hope it helps to solve your problem. What you could also try is to soft reset your GPS. To do that, you need to remove the silver or blue frame around the screen of the GPS (it pops off). Behind this border there is a reset button.
If the map data is completely gone, and you don't have a backup there is only one solution: Buy the latest map for your GPS online and download it to your GPS. It's expensive. In that case it's better to buy a new device in a shop. Most new devices contain Lifetime online map updates (model name nuvi -then the number - LM or LMT) (LM= Lifetime Mapupdates T= Traffic information) Then you can update your map data every three months if you want.

Nov 08, 2013 | Garmin StreetPilot C330 GPS Receiver

1 Answer

Used my garmin edge 305 today on the ride, it worked fine, powered off after the ride. Got home turned on to review my stats and then powered off and went to upload and wouldn't upload, so tried to turn it...

Edge 205 or 305 often crash, then impossible to power on again.

Here is the way to reset the Garmin edge :

Soft reset : hold mode and lap/reset buttons for 10 seconds
Hard reset : device should be powered down, hold start and mode buttons for 3 seconds then pulse press the lap/reset button.

After soft reset, you need to hold start button for up to 10 secs before it starts.

After hard reset, you will loose all your data, including profiles.

Jan 30, 2011 | Garmin Edge 305 GPS Receiver

1 Answer

I can do the same ride with the unit on different bikes and get a variation in total ascent by as much as 200 feet

When starting your device, it acquires sttaelites progressively, then the altitude accuracy is not good at the beginning, so starting altitude and final altitude are not identical if you ride a loop.
Other possible cause is that the cumulation of small errors makes cumulative altitude to vary.
Garmin connect offers a feature that corrects the altitude by smoothing the waypoints, and also by using topology points.
Go to
Then upload your data from your garmin device to the garmin connect database, and use the feature named "altitude correction" bottom left of the screen where your ride is detailed

Aug 27, 2010 | Garmin Edge 305 GPS Receiver

1 Answer

My garmin colorado starts up with the logo of Garmin than nothing Not with a hrd reset neither with a soft reset I can only switch off when the batteries are taken out so start with wheel button pushed...

Hi, if USB connection is OK, you have to make hard reset after that download firmware 3.40 by Uploader (no Garmin WebUploader). Your Co will startup but your data will be lost. Jean

Jul 04, 2010 | Garmin Colorado 300 Handheld GPS Receiver

1 Answer

I have a garmin gps 12--s/n 35854358. No auto-locate?

If you haven't used the gps for a while they can try to operate with the incorrect catalog or time. Unless these are both correct it gets lost. Usually you can correct this with a forced reset. There is also a update for this unit which also forces the update.
The data cable sort of screws on and makes contact with 4 pins. This is the little round connector. It does both power and data. The cable is a wee bit pricey from Garmin but you can make them or just get one from ebay.
The reset usually wipes out any saved routes poi's etc so using the data cable will save all of those. To reset the 12 I believe you hold the lower right corner of the screen and then power it on to reset. Then you need to let it rub until it gets the new data which can take 5-50 minutes. Makes sure your batteries are good.
I'd recommend the data cable route (use a 'gasp' non garmin cheap cable) and upload the update at the same time and you should be good to go try and get lost again.

Jun 28, 2010 | Garmin GPS 12 GPS Receiver

1 Answer

Garmin 305 stops uploading data

Try maybe a different computer and see if it works. If it doesn't then something is wrong with your item. Clearing the history won't help.

Aug 21, 2009 | Garmin Forerunner 305 GPS Receiver

1 Answer

Problem downloading maps to my 76csx

With unit off, press and hold ENTER and PAGE while powering on to perform a master reset.

Doing a master reset will erase and data in the device and restore it to factory defaults. So if you have any waypoints/tracks/routes you may want to back them up first.

You may want to update your mapsoure software first and see if that helps the issue. If not reinstall the software.

oh and double check your micro SD card to make sure its not damaged and is inserted all the way in.

Jan 18, 2009 | Garmin GPSMAP 76 GPS Receiver

2 Answers

How to download from gps to my pc

There is freeware out there provided by the Minnesota Department of Natural Resources that allows Garmin users to download their data in a number of different format. Search "DNRGarmin GPS Application" and follow the instructions. This is great for GIS user because it will download to a shapefile.

It has the ability to upload some data, as well. Although, I suspect there are fewer options for uploading data than, say, Mapsource.

Oct 01, 2008 | Garmin eTrex Legend GPS Receiver

1 Answer

Date not changing

After my ride I needed to stop the timer and reset the device. Then connect to the computer and download the history. It appears that that information I was downloading was from a previous ride.

Jun 26, 2008 | Garmin Edge 305 GPS Receiver

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