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**neilh** · June 6th, 2007, 03:55 PM

Quote: (Originally Posted by david_1)

so what is the best practice for doing this in the green with no refrance. Is it just a feeling that this speed will get you there the right time and then an opps that was too slow or too fast.

Good question - we were wrestling with this on the weekend trying to do 9M/min, but just couldn't get the speed right. Personally I was doing this by checking the depth and time at the start and tracking depth/time as we ascended. You know where 9 (or 10) meters up is so you can tell whether you've got there within the minute or not.

I also believe that you can go slightly faster provided you pause at your target depth for the rest of the minute - but I'm not 100% confident on this! (E.g. 18M -> 9M in 30s, then wait for 30s). It could be that this is ok for 3M/min or 1M/min rates but a bit dodgy for anything faster...

Quote: (Originally Posted by david_1)

dive guages computers do any show your ascent rate in meters/feet per min, I know they all show depth so can be worked out !

Some do - check the manual for what the display shows.

I know the uwatec BT shows the rate, but I seem to remember it has a number of permitted ascent rates based on depth(?) and the rate indicator shows the % of the permitted rate - so it's not that easy to use for fixed rates!

June 6th, 2007, 03:55 PM	#2 (permalink)
neilh(Offline) Haemoglobin on the bus... Join Date: Nov 2005 Location: Barnsley, UK Posts: 1,914	Quote: (Originally Posted by david_1) so what is the best practice for doing this in the green with no refrance. Is it just a feeling that this speed will get you there the right time and then an opps that was too slow or too fast. Good question - we were wrestling with this on the weekend trying to do 9M/min, but just couldn't get the speed right. Personally I was doing this by checking the depth and time at the start and tracking depth/time as we ascended. You know where 9 (or 10) meters up is so you can tell whether you've got there within the minute or not. I also believe that you can go slightly faster provided you pause at your target depth for the rest of the minute - but I'm not 100% confident on this! (E.g. 18M -> 9M in 30s, then wait for 30s). It could be that this is ok for 3M/min or 1M/min rates but a bit dodgy for anything faster... Quote: (Originally Posted by david_1) dive guages computers do any show your ascent rate in meters/feet per min, I know they all show depth so can be worked out ! Some do - check the manual for what the display shows. I know the uwatec BT shows the rate, but I seem to remember it has a number of permitted ascent rates based on depth(?) and the rate indicator shows the % of the permitted rate - so it's not that easy to use for fixed rates!