From e167108c76c4a74ab50561fd59b2158704767a75 Mon Sep 17 00:00:00 2001 From: Dirk Hohndel Date: Sat, 10 Nov 2012 23:11:40 +0100 Subject: Add depth to mbar helper function This ensures that we use consistent math to get the absolute pressure at a certain depth. Signed-off-by: Dirk Hohndel --- divelist.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'divelist.c') diff --git a/divelist.c b/divelist.c index 8819f4ab1..913824838 100644 --- a/divelist.c +++ b/divelist.c @@ -710,7 +710,7 @@ static int calculate_otu(struct dive *dive) int o2 = dive->cylinder[sample->cylinderindex].gasmix.o2.permille; if (!o2) o2 = AIR_PERMILLE; - po2 = o2 / 1000.0 * (sample->depth.mm + 10000) / 10000.0; + po2 = o2 / 1000.0 * depth_to_mbar(sample->depth.mm, dive) / 1000.0; if (po2 >= 0.5) otu += pow(po2 - 0.5, 0.83) * t / 30.0; } @@ -770,8 +770,8 @@ static int calculate_sac(struct dive *dive) } } } - /* Mean pressure in atm: 1 atm per 10m */ - pressure = 1 + (dive->meandepth.mm / 10000.0); + /* Mean pressure in bar (SAC calculations are in bar*l/min) */ + pressure = depth_to_mbar(dive->meandepth.mm, dive) / 1000.0; sac = airuse / pressure * 60 / duration; /* milliliters per minute.. */ -- cgit v1.2.3-70-g09d2