diff --git a/docs/NAVIGATION.md b/docs/NAVIGATION.md
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+++ b/docs/NAVIGATION.md
@@ -18,6 +18,7 @@
   - [Devkit types](console-models/devkit-types.md)
 - Hardware
   - [CPU](hardware/cpu.md)
+  - [POST](hardware/post.md)
   - [Southbridge](hardware/southbridge.md)
   - [eMMC / Flash](hardware/emmc-flash.md)
   - [Facet](hardware/facet.md)
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+# POST
+
+[POST](https://en.wikipedia.org/wiki/Power-on_self-test) codes on Xbox are sent by the southbridge via I2C to an *optional* MAX6958 IC to be displayed via 4x 7-Segment-Displays.
+
+I2C Address: *0x38*
+
+f.e. I2C SDA/SCL pads from [FACET connector](./facet.md) or [RF Unit](./rf-unit.md) can be used.
+
+![7Segment Displays](../_files/post/7_seg_lighted.jpg)
+
+## Schematic
+
+![MAX6958 schematic](../_files/post/max6958_7seg_schematic.png)
+
+## POST Codes
+
+**TBD**
+
+## References
+
+- [MAX6958 Datasheet](https://www.analog.com/en/products/max6958.html)
+- [MAX6958 Display module](https://oshwlab.com/marten_7544/max6958) - Open source design by Martin Feldtmann
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