Let’s say you want to dive to .
After a dive, you have residual nitrogen. To find your Pressure Group (PG):
For his next dive, he wanted to hit 12 meters to photograph the pygmy seahorses. He flipped the card to Table 3. At 12 meters, starting as a Group F diver, his Residual Nitrogen Time (RNT) was 36 minutes. no-decompression limit
