diff --git a/src/shearwater_predator_parser.c b/src/shearwater_predator_parser.c
index 2d3165d..3d9d26d 100644
--- a/src/shearwater_predator_parser.c
+++ b/src/shearwater_predator_parser.c
@@ -348,6 +348,12 @@ shearwater_predator_parser_samples_foreach (dc_parser_t *abstract, dc_sample_cal
 		sample.ppo2 = data[offset + 6] / 100.0;
 		if (callback) callback (DC_SAMPLE_PPO2, sample, userdata);
 
+		// CNS
+		if (parser->petrel) {
+			sample.cns = data[offset + 22] / 100.0;
+			if (callback) callback (DC_SAMPLE_CNS, sample, userdata);
+		}
+
 		// Gaschange.
 		unsigned int o2 = data[offset + 7];
 		unsigned int he = data[offset + 8];