It says in the Geocaching blog “On May 2, 2000, the United States government decided to discontinue restricting GPS accuracy, known as Selective Availability, making GPS technology more accurate for everyone. May 2 became known to geocachers as “Blue Switch Day.” The first geocache was hidden the following day on May 3, 2000”.
Sadly mankybadger has stolen the Blue Switch… the Wherigo cartridge you need to continue can be downloaded from here:
Be sure you have the most recent cartridge before you go out. This was updated on 1 May 2025.