GPS Principles Video

[franknblaster]

GPS position is determined by use of trilateration rather than triangulation. Trilateration uses intersections of spheres. Triangulation uses angles.

Very common mistake.

3 satellites give you 2D, it requires 4 satellites to give 3D position!!!! The 4 satellite is to correct for time and to give altitude or the 3rd dimension.

Couple of other minor errors but otherwise good info. The principles don't change much in GPS.

[whimsicalfuel58]

I love the technology, fyi before I bought I checked out gpssatnavreviews (.) com

[dhcpy]

great video

[mknappdal]

Excellent introduction to GPS.