Zumo 400
Hi There,
The main differences between the 400 and the 500 are the maps that come with the unit and the Bluetooth (i.e. the 400 doesn't have it)
If you're happy with the maps you've got and want to use a non-bluetooth autocom with it, then it should be fine.
I have a 500 and this can take an SD card to boost the map memory (up to 4GB supported by Garmin), flip the bottom cap on your 400 and see if there's a slot there for an SD card
It should be possible to connect the AutoCom directly to the plug jack on the LHS of the Zumo cradle.
Hope this info helps,
David
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