[Myrddin]

I wonder what it will do to the GPS, those pre-quake, do those need to be updated, or will the satelites change it for us? I have software in my GPS around the world, was the change miniscule enough not to matter, or do I need updated software?

The GPS satellites can receive updates from ground stations to adjust ephemeris data. I just received notification from Delorme with updated magnetic declination files for all my mapping products (Street Atlas USA 2003-2004). The north pole has moved enough that current software products and printed maps show an incorrect magnetic north deviation. Those updates were announced BEFORE the quake.

[timestax]

Those updates were announced BEFORE the quake.

AHA!, that must mean something ..but what?!

[Ethyl]

The GPS satellites can receive updates from ground stations to adjust ephemeris data. I just received notification from Delorme with updated magnetic declination files for all my mapping products (Street Atlas USA 2003-2004). The north pole has moved enough that current software products and printed maps show an incorrect magnetic north deviation. Those updates were announced BEFORE the quake.

How and Why were they anounced before the quake?? Or were there enough other quakes to make a difference? So what you are telling me, is, I need new software for my gps to work corectly?