A dive computer is an optional but popular device that serves as an alternative to dive tables. They constantly evaluate your depth, dive time, and nitrogen levels to determine your remaining no-decompression dive time. Some computers even contain digital submersible pressure gauges that can calculate your remaining air time!

This lesson covers the benefits of dive computers, special rules you must follow when using them, and the typical display modes computers use to display information.

After this lesson, you will be able to:

• Explain the benefits of using dive computers.
• State the rules you must follow when using dive computers.
• List the typical computer display modes.
• Identify the typical information contained in various computer display modes.