Just to get a bit technical, you may find this useful:
Frequency - Channel Relationship. The relationship between DME frequency and channels is as follows:
If Channel less than 60
Frequency = 100 + (Channel + 63)/10
If Channel greater than 60
Frequency = 100 + (Channel + 53)/10
If Y Channel
Add 0.05 to Frequency
For Example:
Channel 25Y becomes:
100 + (25 + 63)/10 + 0.05 = 108.85 MHz
