This is one of the interesting loopholes in the PADI Standards and can be found in Key Standards of your PADI Instructor Manual.
Follow the marker to the legend at the bottom of the page and you'll see that they join the Search and Recovery Specialty. If you consider that previous navigational experience is an important prerequisite to search patterns, who better than a diver who has completed the PADI Underwater Navigator Specialty Course.
Listed in Section Three of the PADI Open Water Diver standards, under Dive Flexible Skills, it states that the emergency Weight Drop must be performed either in confind or open water in water too deep in which to stand.
Garb your PADI RDP and we'll begin!
Turn to the back of the table and you'll find Table 3. On this table, you'll find 16m on the left-hand vertical column and the Pressure Group designation C on the top horizontal column.
If you intersect those 2 columns you'll find yourself with 2 numbers, 1 in a white box indicating RNT and the other in a blue box indicating the ABT or new adjusted maximum bottom time for that depth.
Different computer manufacturers use various decompression algorithms and divers may have also had differing dive profile history or conservative dive settings.
This means the guideline is to always err on the side of safety and follow the most conservative computer.
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One of nature's cruel tricks is that Carbon Monoxide is far better at bonding with Haemoglobin in Red Blood Cells than Oxygen is.
Always have cylinders filled at reputable filling stations, check compressor s regularly and have properly located intake pipes.