Bottom timer

Bottom timer is a device used in underwater diving to measure the total time that a diver spends underwater. It is an essential piece of diving equipment that helps divers manage their decompression stops and avoid decompression sickness, also known as the bends.

Function

The primary function of a bottom timer is to track the total time a diver spends underwater from the moment of submersion to surfacing. This is known as the dive time or bottom time. The device also typically displays the current depth and the maximum depth reached during the dive. Some advanced models may also include a dive computer that calculates decompression requirements in real time.

Types

There are two main types of bottom timers: analog and digital.

Analog bottom timers use a mechanical system to track dive time and depth. They are typically less expensive than digital models but require the diver to manually calculate decompression stops.

Digital bottom timers use electronic sensors to measure depth and time. They often include additional features such as temperature readings, ascent rate indicators, and dive log memory.

Use in Diving

In recreational diving, bottom timers are often used in conjunction with dive tables to plan and execute dives safely. In technical diving, they are used to accurately track decompression obligations and gas management.

In scuba diving, the bottom timer is typically worn on the wrist or attached to the BCD. In free diving, it may be integrated into a dive watch.

Safety Considerations

Proper use of a bottom timer is crucial for diver safety. Divers must be trained to read and understand the information provided by the device. Failure to correctly monitor dive time and depth can lead to serious health risks including decompression sickness and oxygen toxicity.