Loss of sound garmin forerunner 305 gps
This is a pretty common problem due to a design flaw in the 305 (although Garmin disagrees). There are open holes on the back of the watch for the speaker which allow sweat to corrode the speaker or material such as sunscreen to block the sound. You can attempt to clear these holes if they're blocked, but it's unlikely to help.
If your watch is still under warranty, call Garmin. As soon as you tell them about the loss of sound, they will arrange for you to exchange your watch for a refurbished one. When you receive your refurb, place tape over the holes to keep the gunk out (doesn't really impact the sound level).
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