I like to cite my sources rather than just make wild unsubstantiated assertions like Kawecki.

Earlier he denied the importance of relativity in Cathode-Ray tube calculations.

Kawecki - do you know the speed of the electrons in a CRT? Does 1 * 10^8 m/s sound fast or what? It's 1/3 the speed of light. At such speeds, the mass of the electron is increased by 25%, and if you do not consider this in deciding how much force is needed to deflect it into the right position, it does not go into the right position.

Here's a guy who mentions both the GPS and his use of relativity in designing CRTs.

http://mathscinotes.wordpress.com/2010/11/05/gps-and-relativity/

Wow - is that guy an idiot or what, huh Kawecki?

This page discusses the CRT math, including the increased mass of these very fast electrons.

http://www.antonine-education.co.uk/physics_a2/options/Module_8/Topic_1/topic_1.htm

also here:

http://www.exo.net/~pauld/activities/physics/relativitytelevision.htm

---

Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)