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.

You'll learn the fundamentals of dive computer use during your PADI Open Water Diver Course and more advanced planning techniques during your PADI Divemaster course.

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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. 

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Because of the increased density of water sound travels approximately 4 times faster through water than through the air.

Every heard someone make a banging sound while diving? It almost always sounds like it's coming from above as the sound hits both ears at the same time causing you to instinctively look upwards.

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. 

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Although the details for PADI Speciality Diver or Specialty Instructor ratings aren't listed in the PADI Instructor Manual, the fundamental information for these courses can be found in Key Standards found between Training Standards and Paperwork and Admin Procedures.

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