Unsure of what the ground points are and how they are calculated (ISS location)

Hi there .

I am looking at the International Space Station and wondered what the attached info all means. Mainly the what the ground point is and how it is calculated.

Also, why are there two orbital speeds?

Thanks

**website you can view it on is http://iss.astroviewer.net/ ***

They are the same speed in different units.

4.765 miles per sec * 3600 sec/hour = 17155 mph

Ah thanks .

Do you know what the ground points are?