X-Git-Url: http://git.tdb.fi/?p=ext%2Fsubsurface.git;a=blobdiff_plain;f=dive.c;h=54784cdbabfb01fbb5c5a8db539cdc481f20c613;hp=f5d0828015e2b64990a390d877839e43335ffd48;hb=HEAD;hpb=9b72217f79f29313d30c87c55f533cc606da6a8f

diff --git a/dive.c b/dive.c
index f5d0828..54784cd 100644
--- a/dive.c
+++ b/dive.c
@@ -472,8 +472,21 @@ struct dive *fixup_dive(struct dive *dive)
 			cyl->sample_end.mbar = 0;
 		}
 	}
-	if (end < 0)
+	if (end < 0) {
+		/* Assume an ascent/descent rate of 9 m/min */
+		int depth = dive->maxdepth.mm;
+		int asc_desc_time = depth*60/9000;
+		int duration = dive->duration.seconds;
+
+		/* Some sanity checks against insane dives */
+		if (duration < 2)
+			duration = 2;
+		if (asc_desc_time * 2 >= duration)
+			asc_desc_time = duration/2;
+
+		dive->meandepth.mm = depth*(duration-asc_desc_time)/duration;
 		return dive;
+	}
 
 	update_duration(&dive->duration, end - start);
 	if (start != end)