hsinhai
Contributor
I've noticed that my NDL never shows anything [...] NDL would be changing based on what depth
I guess it depends a little, I assume when you dive the computer switches into dive mode, and you can see the depth changing correctly? NDL is displayed just above the depth, it normally shows "99+" basically indicating infinity.
It could be that you are doing dives shallower than 12M? in that circumstance it might never drop below 99mins NDL and appear as though it is not working when in fact it is.