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Hansets with different databases are purchased at time of buying the mount. AFAIK the hadsets are not upgradeable. Some info from china regards pricing is as follows:-
1) The size of screw link the mount and tripod is M8. I suggest you use our tripod for the first time. Especially for the GPS device, the mount should be stable and horizonal.
2) For #8402, you should add USD$80, and for #8401, you should add USD$100 in the purchase.
3) The price of the #8411 GPS module is USD$ 98 including the shipment.
If you buy the #8800 GPS AltAzi Mounts , the price is FOB USD$290.
Hope tis helps
Allan
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