Update README.md

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@ -188,6 +188,7 @@ This should work in a classroom provided there isn't too much background noise,
- You'll now be back on the home page, under *Satellites* click `ISS`
- Under *Passes to include* click `all`
- Clicking on any row in the table shows the sky chart for that pass
- The *Alt.* value under *Highest point* is the maximum elevation of the pass, 90 would be directly overhead.
- Imagine holding that picture above your head and aligning it with the compass directions
- It can also be useful to look at the `Ground track`, see link in top right
1. Set the correct time on the Raspberry Pi. QSSTV saves the images with a UTC time filename and this is useful later when working out which ISS passes they are from.