You are almost 100%. I should have spelled out the TLAs... (Three Letter Acronyms...) ;-)

I did intend to have GEO mean Geosynchronus. There is also Geostationary. Geostationary is always in the same position in the sky (over the equator), the only place where it could stay in the sky in the same place at the same time.

Geosynch is always in the same place in the sky at the same time... slightly different.

GPS uses MEO (Medium Earth Orbit) are are typically more visible from the ground than LEOs due to their higher altitude.

XM radio uses 2 (well, actually 4) Geostationary sats... The original ones were name 'Rock' and 'Roll'. The new ones are 'Rhythm' and 'Blues'. These last 2 are the new 'active' ones with the orignal 2 held as spares.

Sirius uses Geosynchronus sats.