Planner: change timestep to 2 seconds

Change the timestep used to calculate tissue pressures and ascents from 3
seconds to 2 seconds. But whats wrong with using 3 seconds?

Deco stops are at 3 m (10') intervals, and our ascent rate is usually
9 m/min (30'/min), or at least multiples of 3 m/min (10'/min).  Hence time
to ascend from one stop to the next stop is 20s (or any factor of 60).
Using 3s increments, we round our ascent interval up to 21 s, which leads
to messy durations and runtimes.

But what about me?  I like SI units and whole decimals.  Don't worry, 2s
timesteps fit nicely when using 10 m/min ascent rate (18 s between stops).

[Dirk Hohndel: edited the commit message to fix minute/second confusion]

Signed-off-by: Rick Walsh <rickmwalsh@gmail.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/planner.c b/planner.c
index be6986679..58b230a56 100644
--- a/planner.c
+++ b/planner.c
@@ -14,7 +14,7 @@
 #include "gettext.h"
 #include "libdivecomputer/parser.h"
 
-#define TIMESTEP 3 /* second */
+#define TIMESTEP 2 /* second */
 #define DECOTIMESTEP 60 /* seconds. Unit of deco stop times */
 
 int decostoplevels[] = { 0, 3000, 6000, 9000, 12000, 15000, 18000, 21000, 24000, 27000,