What does GF mean in scuba?

Low Gradient Factor defines the first decompression stop, while High Gradient Factor defines the surfacing value. Using this method, the GF actually changes throughout the ascent.

What dive computers use Buhlmann?

The Descent Mk1 (currently the only dive computer by Garmin) utilizes the Bühlmann ZHL-16C algorithm and has highly configurable conservatism settings.

What are some of the common signs of decompression sickness?

Symptoms can include fatigue and pain in muscles and joints. In the more severe type, symptoms may be similar to those of stroke or can include numbness, tingling, arm or leg weakness, unsteadiness, vertigo (spinning), difficulty breathing, and chest pain.

How do you calculate decompression stops?

Usually newer dive computers incorporate Deep Stops into their algorithms, and alerts divers when to take a Deep stop. However for those recreational divers wanting to manually calculate when to take one, simply divide your max depth by two and do a 30 second to a minute stop there.

What are gradient factors?

Gradient factors, in the simplest sense, allow exposure limits to be adjusted to become a fraction of other limits. The mathematical power of dive computers allows numerous half-times to be tracked simultaneously, letting any that reach the assigned limit become the leading, and effectively the controlling compartment.

What is a repetitive dive?

Repetitive Dive. This is any dive that you make before you have completely offgassed from any previous dive or dives. Residual Nitrogen Time (RNT) This is the amount of time you must consider as already having been spent at a given depth for a planned repetitive dive.

What algorithm does Shearwater Perdix use?

Shearwater Research has implemented VPM-B according to the original Erik Baker Fortran specification. VPM-B allows a conservatism factor to be adjusted over a range of 0 (least conservative) to +5 (most conservative), the default is +3.

What is GF99 in diving?

GF99 tells you the gradient factor as a percentage for your current depth and time. SurfGF is also useful for dives within the NDL. You can objectively see the effects of doing a 3 minute safety stop and compare it to a 5 minute safety stop or even to having no safety stop at all.

What is ceiling in diving?

Most computers indicate a decompression ceiling for the diver as he begins his ascent, even if the diver has no decompression obligation. This ceiling, which is much deeper than any decompression stop ceiling, only lasts for one to two minutes once the diver reaches it. The diver can then resume his ascent as normal.

What is Buhlmann credibility?

In credibility theory, a branch of study in actuarial science, the Bühlmann model is a random effects model (or “variance components model” or hierarchical linear model) used in to determine the appropriate premium for a group of insurance contracts.

What algorithm does Suunto use?

The Suunto RGBM Heritage At the heart of every Suunto dive computer is an algorithm – the reduced gradient bubble model (RGBM) – that calculates decompression for a dive. Relentlessly pursuing ever best models for divers of all types, Suunto continues to push for RGBM perfection.