PLSN emerged gradually since computer processing of phase data started in 1986. PLSN has been registered internationally in 1997, but it is still not recognized in Poland. Pawel Wiejacz, Institute of Geophysics, Polish Academy of Sciences, ul. Institute of Geophysics, Polish Academy of Sciences, ul. A map of the stations with station coordinates is located on this CD and on the web .
Quanterra stations are dialup with full continuous data mailed on tapes every two months.
MK-6 stations have data analysis on site. The station is very noisy during daily hours at frequencies above 1.5 Hz. Data is in internal MSS format, which is converted to miniseed at the Institute. Long period sampled at 20 Hz and recorded in miniseed. Short period sampled at 100 Hz and recorded in internal MSS format.