The frequency of updating ENC cards depends on the manufacturer, and the period of access to updates depends on the period selected at the stage of purchasing charts.

How often can I update my Electronic Navigational Charts (ENC)?

also you can find out:

What are Electronic Navigational Charts (ENCs)?
How often is the data updated in the mKart App?
How can I check that my Electronic Navigation Chart (ENC) is up to date?
Can I upload additional maps or data to the mKart App ?
What options are there to automatically update the mKart application?

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