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.
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Where were the 100 metres? At the beginning or end of the ride. Take it on another run, you might of just bumped it or it could have been a fluke. If it doesn't work after that try reupdating it. Could be it lost connection with the satelite in your area and missed the recording.
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.
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 http://connect.garmin.com/ 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
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.