# F28 UNS-1 Navdata

**URL:** <https://forum.navigraph.com/t/f28-uns-1-navdata/19161>\
**Category:** Navigraph Hub\
**Created:** [March 31, 2025, 12:28am UTC](https://forum.navigraph.com/t/f28-uns-1-navdata/19161 "2025-03-31T00:28:42Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Hogan01](https://avatars.discourse-cdn.com/v4/letter/h/f6c823/32.png) [@Hogan01](https://forum.navigraph.com/u/Hogan01)\
**Post date:** [March 31, 2025, 12:28am UTC](https://forum.navigraph.com/t/f28-uns-1-navdata/19161/1 "2025-03-31T00:28:42Z")

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I’ve recently purchased the Justflight F28 2 Po for MS2024. I’m having an issue with the latest Navdata (March 2025). It’s missing YSSY and YPPH, at least, as I haven’t tried any others. Can you guys assist with this issue?

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**Author:** ![NAVData](https://dub1.discourse-cdn.com/flex013/user_avatar/forum.navigraph.com/navdata/32/30549_2.png) [@NAVData](https://forum.navigraph.com/u/NAVData)\
**Post date:** [March 31, 2025, 10:54am UTC](https://forum.navigraph.com/t/f28-uns-1-navdata/19161/2 "2025-03-31T10:54:56Z")

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Hi,  
First of all, welcome. Thanks for contacting us …

Unfortunately, this is not an issue that we can fix, and I will try to explain it (sorry, when it´s too technical):  
Our data for the Justflight F28 includes both airports, but the airport file will be truncated due to the wrong file size in the `layout.json` file, which is needed to load the data.

Here is what Justflight offers:

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/3X/8/3/83027149800c4980a265d304f59c8dcd406677b8.png)

… but the current (AIRAC 2503) filesize of the `apts.txt` is larger (2813658 bytes), which means the sim cuts these files on position X, and all lines below can´t be entered.

When you change the filesize now in the `layout.json` file, and you restart the sim …

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/3X/f/1/f17ba594381b2f7a0073a4c4f0a3b476f5a143fb.png)

.. you will see that both airports can be entered as expected:

 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/3X/0/2/02e61872ca40d4bc32c5a90bbdfb3926aa7bbe1e.jpeg)  
 ![image](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/3X/d/4/d4f112647af9be40b26701297158ce44e1118a6a.jpeg)

This `layout.json` file is not one that we offer—it will be created by an ASOBO tool, and it looks like Justflight doesn´t use this tool when a new cycle is identified.

So, please report this to Justflight - I can´t identify any navdata issue. It looks more like an addon issue. Sorry when it seems too technical, but describing the current issue is not easy.

Please let me know when you have follow-up questions, and I’m sorry when I don´t have any better news.

Cheers,  
Richard

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**Author:** ![system](https://europe1.discourse-cdn.com/flex013/uploads/navigraph1/original/1X/4cc83e90d70ab312b1bd2d7527bddad309607265.png) [@system](https://forum.navigraph.com/u/system)\
**Post date:** [April 2, 2025, 10:55am UTC](https://forum.navigraph.com/t/f28-uns-1-navdata/19161/3 "2025-04-02T10:55:27Z")

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