Suunto D4's 50%RGBM Model?

[divecor]

I recently bought the Suunto D4 basically because Suunto wrote in the advertisement that one can change the RGBM setting to 50% which will give the diver extra bottom time.
I am an instructor and made so far 169 dives with this computer so I had a lot of possibilities to compare the D4's program with other dive computers in this so called 50% setting.
I never in all these dives found that it gave me this promised extra bottom time, and this against a lot of different kind of brands, surprisingly is even more that when I compared my D4's bottom time against other models of Suunto like the Mosquito, the Cobra, the Vyper and some elderly models it is exactly the same.
Once in decompression compared to a Vyper this morning the Vyper gave 3 minutes of decompression and the D4 4, the D4 however comes after the decompression with 3 extra minutes of safety stop which the Vyper doesnÃÕ one questions himself whether this is really necessary?
Has someone the same experiences?

 

[sucnip]

50% RGBM mode does not give you more bottom time... exactly. RGBM punishes you by shortening your bottom time if you do one of several naughty things during a dive including, reverse profile, deco, going up to fast or have too short of a surface interval. RGBM 50% mode reduces the imposed penalty by half if one is incurred.

Best way to explain it is to keep an eye on the diver alert symbol you see after a dive. This looks like a "!" inside a triangle. The symbol advises you to extend your surface interval. If you do another dive while this symbol is on you may have less bottom time. When in 50% RGMB mode the symbol stays on all the time.

Hope this helps.

Regards,
David

 

[divecor]

This is not the advertisement from Suunto, they claim extended bottom time, what you mention here might be right but it is not in the instruction manual, I'll give it a close look tomorrow morning you made me curious.
I manage to stay in the ranges of this computor but deco is two out of three dives here and if this is what he cannot handle Suunto should not sell it as a decompression computer.

Regards,

Cor