Mathematicaly plotted by an engineer, who has taken these measures for a year and nine months.
- The measured drift distance has more than doubled within the last one year and nine month time. The GPS is hanging on my kitchen wall in one position and does not move. The trip distance is measured and recorded each day. The two trend lines give a conservative future (straight line) and a potential rapid change (polynomial) future. The real future can be estimated somewhere between these two trend lines. During this same time frame the average angle of instantaneous motion has been gradually changing from mostly westerly to mostly south. If one averages the predominant earth wobble directions motions then one gets South as the average result. The motions being measured are getting bigger with time by a factor of more than two. These measurements are over and above what is being compensated for by the regular position correction updates done by the GPS managing agencies.
- May 15, 2005