When I look closely into PADI's RDP table, I noticed that Table 3 is actually Table 1 with a matrix rotate. And that makes sense. For example, if I made a dive at 35ft for 10min (Group A), and then take 10min S.I. (still Group A). Now if I look up table 3 at 35ft, my RNT is 10min (at 35ft) which is exact the same time as my first dive (of course, because that's what I just did).
However, when I look up NOAA's air table, Chart 1 (table 1) and Chart 3 (table 3) are not the same. If you checked them, they don't just make a matrix rotate, the number has add up around 1min in each cells. For example, if I made a dive at 12.2m for 12min (Group A), and then take 10min S.I. (Still Group A). Now if I look up RNT at Chart 3, my RNT will be 13min (at 12.2m). Well, I can understand if the RNT after S.I. at the same depth is the same or smaller, but I don't understand why it became 1min more than the original RNT. In other words, according to NOAA's air table, if I dive 12min at 12.2, then I would have 163-12=151min left before deco. However, if I surface and take 10min break and then start the next dive, my NDL now become 150min. And that don't make sense to me. I understood this is not a big issue and it might be a minor question. Most people probably don't care, but I want to know if there is any reasonable explanation for this.
However, when I look up NOAA's air table, Chart 1 (table 1) and Chart 3 (table 3) are not the same. If you checked them, they don't just make a matrix rotate, the number has add up around 1min in each cells. For example, if I made a dive at 12.2m for 12min (Group A), and then take 10min S.I. (Still Group A). Now if I look up RNT at Chart 3, my RNT will be 13min (at 12.2m). Well, I can understand if the RNT after S.I. at the same depth is the same or smaller, but I don't understand why it became 1min more than the original RNT. In other words, according to NOAA's air table, if I dive 12min at 12.2, then I would have 163-12=151min left before deco. However, if I surface and take 10min break and then start the next dive, my NDL now become 150min. And that don't make sense to me. I understood this is not a big issue and it might be a minor question. Most people probably don't care, but I want to know if there is any reasonable explanation for this.