Depending on where he was flying near the seaplanes, the airspace is controlled. There is also a helipad nearby within that controlled airspace.
https://www.cbc.ca/news/canada/british-columbia/control-tower-vancouver-1.5486221
Just a few comments, as a former US Air Force GPS satellite operator. Your number of satellites is changing because the satellites are orbiting at a 12 hour interval. Meaning, they rotate around the Earth once every 12 hours, or twice per day...
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