This Recommendation gives a methodology for radionavigation-satellite service (RNSS) intersystem interference estimation to be used in coordination between systems and networks in the RNSS. As Resolution 610 (WRC-03) applies to all systems and networks in the RNSS and contains measures that are designed to facilitate RNSS inter-system compatibility determination@ this Recommendation is applicable to the RNSS in the bands 1 164-1 215 MHz@ 1 215-1 300 MHz@ 1 559-1 610 MHz and 5 010-5 030 MHz.