How do I calculate my residual nitrogen time using an ERDP?

[wolflegresley]

So my wife and I learned how to fill out our logbook by using the RDPs themselves so we could always fill out the RNT block on the dive profile.

We recently bought an ERDP (ML) which is perfect at nailing the pressure group but it dosen't give us our RNT. Is there a way to calculate that via the ERDP? or must we do the tables manually to calculate the RNT?

 

[Scott]

You'll have to use the RDP to find the RNT. The eRDP(ml) calculates it for you but doesn't display it.

 

[wolflegresley]

Thanks! Practice makes perfect!

 

[tursiops]

I haven't tried it, but i suspect you can use the ERDP to get your allowable dive time, and then do it again assuming it is the first dive. The difference should be the RNT.

 

[boulderjohn]

The only reason you need to know your RNT is so that you can complete the table calculations. The RNT step is included in the eRDP calculations, so if you are using it, you don't need to know it.

 

[KeithG]

Thanks! Practice makes perfect!

My dive buddy always reminds me that "Practice makes permanent". She has seen me golf.

 

[fire_diver]

The only reason to know RNT is if you getting ready to make a dive after a short SI. Filling that info in a logbook is just wasted effort.