Geocache Positioning System
All traditional geocaches are simultaneously transmitting a distinguishable homing signal using a unique 128-bit long binary phase shift keyed isochronic precision code pseudo-random noise sequence on 15.7542 kHz code division multiple access spread-spectrum audio band carrier frequency. A reasonable number of these beacons can be detected in up to one kilometer range using a laptop PC as a receiver.
Click on this image, which I took while standing at the cache. If you listen carefully, you should be able to locate it precisely. If your dilution of precision is not good, don't hesitate to use the calibration service.
![[FIN]](http://www.geocaching.com/images/icons/flags/png/fi.png)
Suomenkielinen tiivistelmä: Määritä kätkön sijainti soveltamalla GPS-järjestelmän toimintaperiaatteita kuvauksessa esitetyllä tavalla. Välituloksia voit halutessasi tarkastuttaa kalibrointipalvelussa.