I just started to recently get back into Orbiter and i been getting fit with DeltaGlider IV again and i don't know a hole lot about using the sim so i am using the DG IV for now getting use to things but I can get into orbit by the computer PR903Spec42 but then once im in orbit i Target The ISS for docking and it says i need to Set Nav 1 for Frequency docking. The thing is im not sure exactly what its asking, i can find the location of Nav 1 and 2 and the third thing XPDR which is below it but im not sure what Frequency i should set it on. Like how do i know which frequency to use, is there some sort of math problem involved or what? Please help thanks 