Context: Frequencies for COMPASS are allocated in four bands: E1, E2, E5B, and E6 and overlap with Galileo. The fact of overlapping could be convenient from the point of view of the receiver design, but on the other hand raises the issues of inter-system interference, especially within E1 and E2 bands, which are allocated for Galileo's publicly regulated service. However, under International Telecommunication Union (ITU) policies, the first nation to start broadcasting in a specific frequency will have priority to that frequency, and any subsequent users will be required to obtain permission prior to using that frequency, and otherwise ensure that their broadcasts do not interfere with the original nation's broadcasts. It now appears that Chinese COMPASS satellites will start transmitting in the E1, E2, E5B, and E6 bands before Europe's Galileo satellites and thus have primary rights to these frequency ranges.

Question: How many frequencies does the COMPASS system use?
Answer: four bands

Question: What are the four bands of frequencies used by the COMPASS system called?
Answer: E1, E2, E5B, and E6

Question: Which frequency bands are most likely to cause issues of inter-system interference with the Galileo system?
Answer: E1 and E2

Question: Which bands are used by the Galileo system for their public service?
Answer: E1 and E2

Question: According to International Telecommunication Union (ITU) policies, who is given higher priority to a specific frequency band?
Answer: the first nation to start broadcasting in a specific frequency

Question: Frequencies for COMPASS overlap with Genesis and are allocated in how many bands?
Answer: Unanswerable

Question: Which countries satellites will transmit in E3 before Galileo satellites?
Answer: Unanswerable

Question: Which countries satellites will transmit in E3 before COMPASS satellites?
Answer: Unanswerable

Question: Frequencies for NASA are allocated in how many bands?
Answer: Unanswerable

Question: Aside from B3, E1 and E34, what is the other band of frequency used by COMPASS?
Answer: Unanswerable