Wednesday, March 13, 2019

Traveling on April 6? Bring a Map … and a Watch

Artist's conception of the constellation of Global Positioning
System satellites orbiting the Earth (NASA image)
The US Department of Homeland Security says there could be glitches in Global Positioning System, or GPS, when the on-board clocks of the satellite constellation "roll over" from week 1023 to week 0. 

According to the ARRL Letter, some units may misinterpret the rollover, shifting the date back to January 1, 1980 or another date. This may eliminate tiny changes that have been made since 1980 to timekeeping standards, which may in turn affect location accuracy. DHS has guidelines on dealing with potential issues at <>.