Yeah, a little history and even better, a quick explanation of how it works. Most people don't know that a GPS app needs 2 sources of data. It determines your point in space by triangulating radio signals from GPS satellites. But then it needs map data to tell you where you are on earth. You usually have to have an internet connection to get the map data. But some apps allow you to download map data in advance. Those apps work even if you do not have an internet connection. Did you know that the triangulation calculations have to take relativistic effects into account? The satellites are moving around the earth. If you did not include Einstein's Theory of Relativity in your calculations, you'd be off target. On 8/6/19 8:37 AM, Bell, Lance (HSAL) wrote:

First, The History of the GPS (military) and the potential accuracy of Hardware Secondly, The Gift of GPS for the V.I. / Blind World and how amazing the apps are for us. (Maybe everyone knows, however that is what the topic is.

The apps are so amazing ... right from Apple / Google Maps and the GPS to Blindsqure, "Soundscape" Thanks Microsoft, the Transit Apps, and even the how Apple can determine where your pictures were taken and then group them together.

If you record it I would like to hear it, Lance Bell

-----Original Message----- From: John G Heim Sent: August-05-19 4:07 PM To: Blind sysadmins list Subject: [Blind-sysadmins] Advice on GPS talk

I am giving a talk about GPS for the blind at a convention fro blind people. I want to make sure my talk is complete. If you were giving such a talk, what items would you cover? Hardware? Software?