diff --git a/src/cochran_commander_parser.c b/src/cochran_commander_parser.c
index 7802ea1..1873a46 100644
--- a/src/cochran_commander_parser.c
+++ b/src/cochran_commander_parser.c
@@ -501,6 +501,9 @@ cochran_commander_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callb
 	sample.temperature = (data[layout->start_temp] - 32.0) / 1.8;
 	if (callback) callback (DC_SAMPLE_TEMPERATURE, sample, userdata);
 
+	sample.gasmix = 0;
+	if (callback) callback(DC_SAMPLE_GASMIX, sample, userdata);
+
 	while (offset < size) {
 		const unsigned char *s = samples + offset;
 
diff --git a/src/cressi_leonardo_parser.c b/src/cressi_leonardo_parser.c
index d9ed79c..656f487 100644
--- a/src/cressi_leonardo_parser.c
+++ b/src/cressi_leonardo_parser.c
@@ -149,6 +149,9 @@ cressi_leonardo_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callbac
 	unsigned int time = 0;
 	unsigned int interval = 20;
 
+	unsigned int gasmix_previous = 0xFFFFFFFF;
+	unsigned int gasmix = 0;
+
 	unsigned int offset = SZ_HEADER;
 	while (offset + 2 <= size) {
 		dc_sample_value_t sample = {0};
@@ -166,6 +169,13 @@ cressi_leonardo_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callbac
 		sample.depth = depth / 10.0;
 		if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+		// Gas change.
+		if (gasmix != gasmix_previous) {
+			sample.gasmix = gasmix;
+			if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+			gasmix_previous = gasmix;
+		}
+
 		// Ascent rate
 		if (ascent) {
 			sample.event.type = SAMPLE_EVENT_ASCENT;
diff --git a/src/mares_darwin_parser.c b/src/mares_darwin_parser.c
index d4d13da..ac2c16f 100644
--- a/src/mares_darwin_parser.c
+++ b/src/mares_darwin_parser.c
@@ -217,8 +217,15 @@ mares_darwin_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t
 
 	unsigned int time = 0;
 
+	unsigned int mode = abstract->data[0x0C] & 0x03;
 	unsigned int pressure = array_uint16_be (abstract->data + 0x17);
 
+	unsigned int gasmix_previous = 0xFFFFFFFF;
+	unsigned int gasmix = gasmix_previous;
+	if (mode != GAUGE) {
+		gasmix = 0;
+	}
+
 	unsigned int offset = parser->headersize;
 	while (offset + parser->samplesize <= abstract->size) {
 			dc_sample_value_t sample = {0};
@@ -238,6 +245,13 @@ mares_darwin_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t
 			sample.depth = depth / 10.0;
 			if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+			// Gas change.
+			if (gasmix != gasmix_previous) {
+				sample.gasmix = gasmix;
+				if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+				gasmix_previous = gasmix;
+			}
+
 			// Ascent rate
 			if (ascent) {
 				sample.event.type = SAMPLE_EVENT_ASCENT;
diff --git a/src/mares_nemo_parser.c b/src/mares_nemo_parser.c
index 33e5916..29b51b1 100644
--- a/src/mares_nemo_parser.c
+++ b/src/mares_nemo_parser.c
@@ -358,6 +358,13 @@ mares_nemo_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t c
 			pressure = array_uint16_le(p + parser->header + 4);
 		}
 
+		// Initial gas mix.
+		unsigned int gasmix_previous = 0xFFFFFFFF;
+		unsigned int gasmix = gasmix_previous;
+		if (parser->mode == AIR || parser->mode == NITROX) {
+			gasmix = 0;
+		}
+
 		unsigned int time = 0;
 		for (unsigned int i = 0; i < parser->sample_count; ++i) {
 			dc_sample_value_t sample = {0};
@@ -378,6 +385,13 @@ mares_nemo_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t c
 			sample.depth = depth / 10.0;
 			if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+			// Gas change.
+			if (gasmix != gasmix_previous) {
+				sample.gasmix = gasmix;
+				if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+				gasmix_previous = gasmix;
+			}
+
 			// Ascent rate
 			if (ascent) {
 				sample.event.type = SAMPLE_EVENT_ASCENT;
diff --git a/src/suunto_eon_parser.c b/src/suunto_eon_parser.c
index 70fa74f..714df34 100644
--- a/src/suunto_eon_parser.c
+++ b/src/suunto_eon_parser.c
@@ -275,6 +275,10 @@ suunto_eon_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t c
 	sample.depth = 0;
 	if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+	// Initial gas mix.
+	sample.gasmix = 0;
+	if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+
 	unsigned int depth = 0;
 	unsigned int time = 0;
 	unsigned int interval = data[3];
diff --git a/src/suunto_solution_parser.c b/src/suunto_solution_parser.c
index 8372457..e8e6986 100644
--- a/src/suunto_solution_parser.c
+++ b/src/suunto_solution_parser.c
@@ -170,6 +170,8 @@ suunto_solution_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callbac
 		return DC_STATUS_DATAFORMAT;
 
 	unsigned int time = 0, depth = 0;
+	unsigned int gasmix_previous = 0xFFFFFFFF;
+	unsigned int gasmix = 0;
 
 	unsigned int offset = 3;
 	while (offset < size &&	data[offset] != 0x80) {
@@ -193,6 +195,13 @@ suunto_solution_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callbac
 			}
 			sample.depth = depth * FEET;
 			if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
+
+			// Gas change.
+			if (gasmix != gasmix_previous) {
+				sample.gasmix = gasmix;
+				if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+				gasmix_previous = gasmix;
+			}
 		} else {
 			// Event.
 			sample.event.type = SAMPLE_EVENT_NONE;
diff --git a/src/suunto_vyper_parser.c b/src/suunto_vyper_parser.c
index 6bcd3ac..3b46539 100644
--- a/src/suunto_vyper_parser.c
+++ b/src/suunto_vyper_parser.c
@@ -319,6 +319,8 @@ suunto_vyper_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t
 	if (rc != DC_STATUS_SUCCESS)
 		return rc;
 
+	unsigned int gauge = data[4] & 0x40;
+
 	// Time
 	sample.time = 0;
 	if (callback) callback (DC_SAMPLE_TIME, sample, userdata);
@@ -327,6 +329,12 @@ suunto_vyper_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_t
 	sample.depth = 0;
 	if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+	// Initial gas mix
+	if (!gauge) {
+		sample.gasmix = 0;
+		if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+	}
+
 	unsigned int depth = 0;
 	unsigned int time = 0;
 	unsigned int interval = data[3];
diff --git a/src/uwatec_memomouse_parser.c b/src/uwatec_memomouse_parser.c
index ce52200..d03d31b 100644
--- a/src/uwatec_memomouse_parser.c
+++ b/src/uwatec_memomouse_parser.c
@@ -216,6 +216,9 @@ uwatec_memomouse_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callba
 
 	unsigned int time = 20;
 
+	unsigned int gasmix_previous = 0xFFFFFFFF;
+	unsigned int gasmix = 0;
+
 	unsigned int offset = header + 18;
 	while (offset + 2 <= size) {
 		dc_sample_value_t sample = {0};
@@ -233,6 +236,13 @@ uwatec_memomouse_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callba
 		sample.depth = depth * 10.0 / 64.0;
 		if (callback) callback (DC_SAMPLE_DEPTH, sample, userdata);
 
+		// Gas change.
+		if (gasmix != gasmix_previous) {
+			sample.gasmix = gasmix;
+			if (callback) callback (DC_SAMPLE_GASMIX, sample, userdata);
+			gasmix_previous = gasmix;
+		}
+
 		// Warnings
 		for (unsigned int i = 0; i < 6; ++i) {
 			if (warnings & (1 << i)) {