# \#unknown-ctd

**URL:** https://forum.navigraph.com/tag/unknown-ctd/56.md

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## [MSFS 2020 CTD when use navigraph base navdata](https://forum.navigraph.com/t/msfs-2020-ctd-when-use-navigraph-base-navdata/21409)

<div class="topic-metadata">

**Author:** [@WingedWing283](https://forum.navigraph.com/u/WingedWing283)\
**Replies:** 16\
**Last updated:** [November 20, 2025, 6:51am UTC](https://forum.navigraph.com/t/msfs-2020-ctd-when-use-navigraph-base-navdata/21409 "2025-11-20T06:51:50Z")

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Since I updated msfs2020 to version 1.39.9.0, once I install and use the msfs basic navigation data published by navigraph (with “navigraph-navdata” and “navigraph-navdata-base” folders installed in the Community directo…