20 Most Recent Garmin Forerunner 305 GPS Receiver Questions & Answers

Download the Garmin usb drivers from the Garmin website.

if that is the case I would suspect a bad battery

I Have had the same problem couple of times (and forgotten each time how I solved it). I figured it out just now and this is what I did.

1) turn on unit and put on heart monitor (make sure battery is good and wet heart strap)
2) using the mode button navigate the menus to: Settings: General: Accessories: Heart Rate Monitor
3) Once in the Heart Rate Monitor option make sure "Yes" is selected and then use the arrow buttons to highlight "Restart Scan" . Press the enter button to rescan for your heart monitor. (I had to rescan twice)
Go back to the main monitor screen to see if you are recieving heart rate signals.

I am not sure why a manual rescan needs to be done every time but it would be nice if Garmin fixed this issues in a unit software update (my unit has software version 2.80)

I am new to the Garmin Edge 305, and started getting this problem yesterday. Indeed, yesterday it was the first time that I downloaded Courses.

I followed the Guest solution, deleted all new courses from my Garmin, and it now WORKs!!!!

Uploading my courses back again to the Garmin made the problem return back. I need some more work to identify the bad course.

Automotive silicon/gasket maker.

Use a tooth pick to put a VERY small amount of silicon around the entire seam. Put the two half's together and wrap tightly with electrical tape. Test the unit immediately to see if it powers on and off. If it does not open it back up and raise the small prongs that make the connection from the bottom half to the top half.
If any silicon squishes out the sides wipe with water and a rag.
Let the unit sit over night. In the morning remove the tape.

Welcome to Fixya !

There are TONS of Li-ion cell and mobile phone batteries as well as those sold to the RC hobbiest. Your best bet its to reach the nearest radio store and try to find a 3.7V Li-ion, 750 mAH battery with these exact dimensions (or smaller) and you will be fine. >305 battery dimensions:? H 33.5mm x W 35.0mm x D 5.5mm
Any battery with these specs should fit perfectly into your device.

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Hey, I install Garmin GPS Chipset Type G and now it seems work well.

Try first changing the battery if you have but if not better call Garmin and let them repair or replace it if its still under warranty..

Hope that helps..........