Got an older GPS receiver?

You may be in for a surprise tomorrow - from Ars Technica:

GPS “rollover” event on April 6 could have some side-effects
On April 6, the Global Positioning System will reach the end of an era—or more correctly, an epoch. That’s when the Coordinated Universal Time (UTC) clock used by the satellite navigation system will reach the limit for its 10-bit “week number” (WN) counter and flip back to 0000000000.

GPS time is linked to the official UTC clock time provided by the US Naval Observatory. But the GPS version of the clock tracks the date by counting the number of weeks since the beginning of the current GPS “epoch”—August 21, 1999. So as the clock reaches midnight tonight on the prime meridian, the GPS calendar will suddenly become 20 years out of date.

This is sort of like the Y2K nothingburger from 19 years ago as well as the Unix date bug which will destroy civilization on January 19th, 2038. Older GPS receivers __may__ be affected but newer ones know about this and correct.