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https://ww2.jeppesen.com/update-cycle-and-effective-dates-schedule/

in the link provided above, Jeppesen NavData has 28day cycle whereas Digital Terminal Charts have 14day cycle Can you provide the reason for varying update cycles

i am aware by the name Terminal charts means airports information and approach plates, SIDs & STARs but what does NavData contain ?

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Terminal charts are published per a 14-day cycle which is usual in IFR chart circulation.

Jeppesen states on their website that the NavData pack is published according to the 28-day AIRAC cycle.

The NavData pack contains navigational charts, terrain/obstacle data, and data for RNP/LPV.

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