TAG: Letters

Letters to the Editor

October 1, 2013By
Constellation snapshot for a specific date/time: GPS week 1749 (725) and GPS seconds 86400 = July 15, 2013, at midnight GPS Time.

Orbital Planes, Nightmares, Pioneers Good morning, Dr. Langley, I have a seven-year-old drawing of GPS satellites in their orbital planes that I found (can’t recall where) some years ago, either on a website or from a colleague who attended some GPS forum. Would you know of a site where I can find current information on GPS satellite locations, which ones... read more

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Letters to the Editor: Smartphone Revolution

January 1, 2010By

Readers comment on Frank van Diggelen's article "The Smartphone Revolution" from the December 2009 issue. read more

This article is tagged with and posted in From the Editor