The scrying spell allows you to place an invisible sensor anywhere you've seen before. You can see and hear through the sensor as if you were there
Imagine this scenario: I've seen the top of a mountain from far before, so I decide to use scrying to create a sensor there. From the top of the mountain using the sensor, I can see the top of another mountain and I later use scrying to see from the top of that mountain, and so forth.
As written it seems that "seeing" a location using the scrying spell allows you to subsequently see from that location using the scrying spell. Is this correct?