X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=dive.c;h=aee09d53a8b37796fc6f2fa0e448f92102be745e;hb=ed1ce8ebc8590533291a9c5d6460f8d1c9f857dd;hp=f5d0828015e2b64990a390d877839e43335ffd48;hpb=e8ec3df371f0496a52ebdc463245d7b9df3be6ff;p=ext%2Fsubsurface.git

diff --git a/dive.c b/dive.c
index f5d0828..aee09d5 100644
--- a/dive.c
+++ b/dive.c
@@ -472,8 +472,20 @@ 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;
+
+		/* Protect against insane dives - make mean be half of max */
+		if (duration <= asc_desc_time) {
+			duration = 2;
+			asc_desc_time = 1;
+		}
+		dive->meandepth.mm = depth*(duration-asc_desc_time)/duration;
 		return dive;
+	}
 
 	update_duration(&dive->duration, end - start);
 	if (start != end)