Can anyone please explain this better for me.

"In order to use TACAN we must first find the channel which corresponds to a Flight Simulator VOR
frequency. Without going into too much boring detail, TACAN channel consists of a 3-digit integer,
followed by the letter X or Y. X channels cover all frequencies with 0 or 1 decimal places (0 to 9 kHz). Y
channels cover any frequencies which end in 2 decimal places (0.5 kHz). For example frequency 116.80
translates to channel 115X and 116.85 becomes CH 115Y. 116.90 is CH 116X, and so on..."

Thanks

Ben