# Navgraph does not detect an active sim running X-Plane 11 on Mac OS Big Sur

**URL:** <https://forum.navigraph.com/t/navgraph-does-not-detect-an-active-sim-running-x-plane-11-on-mac-os-big-sur/4570>\
**Category:** General non MSFS data\
**Created:** [March 16, 2021, 6:59pm UTC](https://forum.navigraph.com/t/navgraph-does-not-detect-an-active-sim-running-x-plane-11-on-mac-os-big-sur/4570 "2021-03-16T18:59:23Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![RustyBell](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@RustyBell](https://forum.navigraph.com/u/RustyBell)\
**Post date:** [March 16, 2021, 6:59pm UTC](https://forum.navigraph.com/t/navgraph-does-not-detect-an-active-sim-running-x-plane-11-on-mac-os-big-sur/4570/1 "2021-03-16T18:59:23Z")

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Installed Navgraph Charts 7.3.7 on Mac OS Big Sur - Running X-Plane 11.52R1 Navgraph does not detect a running sim. How to fix this?

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**Author:** ![Ian](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.navigraph.com/ian/32/154_2.png) [@Ian](https://forum.navigraph.com/u/Ian)\
**Post date:** [March 16, 2021, 8:10pm UTC](https://forum.navigraph.com/t/navgraph-does-not-detect-an-active-sim-running-x-plane-11-on-mac-os-big-sur/4570/2 "2021-03-16T20:10:15Z")

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Hi…,

Welcome.

We shall investigate . In the meantime please use [FMS Data Manual Installations](https://navigraph.com/account/downloads/fmsdm)

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/2X/3/3419146d94517dbd9f6220bca19c2ad884333934.png)

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/2X/3/33a6e368fb8f9dfb830abca056038fd5ab51d5bf.png)

Cheers  
Ian

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<div class="post-metadata">

**Author:** ![RustyBell](https://avatars.discourse-cdn.com/v4/letter/r/c2a13f/32.png) [@RustyBell](https://forum.navigraph.com/u/RustyBell)\
**Post date:** [March 17, 2021, 1:07pm UTC](https://forum.navigraph.com/t/navgraph-does-not-detect-an-active-sim-running-x-plane-11-on-mac-os-big-sur/4570/3 "2021-03-17T13:07:57Z")

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Hi Ian - problem resolved - I reinstalled the Navgraph app including Simlink (had to do the Simlink a couple of time) when starting X-Plane the app crashed on start up - retried and this time came up - still no running sim detected, Closed X-plane and Navgraph then restarted Navgraph and then started X-Plane and vola the Sim was detected. It was like learning the L1011-500 Digital acft back in 1980 when if all else failed - shut the acft down - get off the acft and walk around it 3 times then get back in and try it again.  
Tks for the prompt action on your part  
Brgds rusty