[phs2501]

Yes but the math (which happens in the receiver, so can be replicated by a user with an open source receiver) would be very different. You actually wind up with a 3D position relative to the Earth's center, which then needs to be mathematically mapped to lat/lon - that's what the WGS84 datum is for.

[IAmBroom]

All of which is irrelevant to GPS users. I can't remember the last time I checked the math that my GPS was performing, to be sure it was mapping to a rough sphere.