The voice quality is so poor when using a wired headset that a conversation is impossible. I have tried several different microphones and they are all pretty poor. could it be a Zumo fault on the microphone input side all other functions including blue tooth are fine
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there is a speaker on the cradle for the car and none on the bike cradle probably due to the exposure to the elements when on the bike and i think the Zumo must be powered from the bike for the speaker on the Zumo to work when riding.
The 550 relies on the car base for audio as it has no speaker. If the base is not powered up it will not amplify the sound out of the GPS unit, Check the in-line fuse on the power cord, it is usually located in the tip of the cigarette lighter adapter. twist off the tip and this should expose a fuse.
HAve you tried connecting to it with a bluetooth headset, this should work regardless of whether or not it is on the base.
Have you tried someone elses car cradle? There is a small amp in the car cradle which is probably fried, Is it under warranty? If so ship it back, if not, find another zumo user to test if it's the cradle or not, then still try Garmin, if the response is 'no warranty', shop for a cradle on ebay..seen them NEW for less than $ 50
How do you load maps? and are these Garmin maps. I try to keep the Zumo original and use an SD card for extra maps. Did you try this yet? And if you are using SD cards, try a different brand/quality. I had some lockups with crappy budget cards. Kingston, Sandisk and some other A brands work fine!