| Some bottom timers have a timer which shows the dive time in minutes and seconds. This timer can be reset at any moment during the dive (of course the total dive time will always be visible in minutes at a different place on the screen).
So if you start your ascent reset the timer and control your speed to 10m/min by checking that the timer counts 6 seconds for each meter you ascent.
Monitoring the depth and time simultaneously can be a bit awkward and it helps if you just check the depth and count to 6 (mentally) for every meter you ascent. And in addition to this, check the timer a few times during the ascent as an extra check (say for every 5 meters 30 seconds should have passed). A nice thing about this method is you can read the total ascent time when you surface.
Although I think at the end of the day one should be able to 'feel' if the ascent rate is right or not. And just use the bottom timer to make corrections.
So this is what I do, any comments? |