GPS update on 2016 CX--5 GT

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Mazda, GT,
Is the update free for the 1st three years. Mine would run out in April 2018. How often should it be updated. How much are the updates after 3 years.
 
I've been curious about the cost of the updates myself. I believe there are "supposed" to be two updates per year, but I've been doing it once/year myself. They certainly don't make it easy to find out the cost, you may have to e-mail them.
 
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