diff --git a/include/libdivecomputer/parser.h b/include/libdivecomputer/parser.h
index a9b0fea..ffa66fc 100644
--- a/include/libdivecomputer/parser.h
+++ b/include/libdivecomputer/parser.h
@@ -46,9 +46,13 @@ typedef enum dc_sample_type_t {
 	DC_SAMPLE_PPO2,
 	DC_SAMPLE_CNS,
 	DC_SAMPLE_DECO,
-	DC_SAMPLE_GASMIX
+	DC_SAMPLE_GASMIX,
+	DC_SAMPLE_TTS,		// time to surface in seconds
 } dc_sample_type_t;
 
+// Make it easy to test support compile-time with "#ifdef DC_SAMPLE_TTS"
+#define DC_SAMPLE_TTS DC_SAMPLE_TTS
+
 typedef enum dc_field_type_t {
 	DC_FIELD_DIVETIME,
 	DC_FIELD_MAXDEPTH,
diff --git a/src/garmin_parser.c b/src/garmin_parser.c
index 6a33d87..c6c6990 100644
--- a/src/garmin_parser.c
+++ b/src/garmin_parser.c
@@ -399,7 +399,14 @@ DECLARE_FIELD(RECORD, next_stop_time, UINT32)		// seconds
 	garmin->record_data.pending |= RECORD_DECO;
 	garmin->record_data.stop_time = data;
 }
-DECLARE_FIELD(RECORD, tts, UINT32) { }			// seconds
+DECLARE_FIELD(RECORD, tts, UINT32)
+{
+	if (garmin->callback) {
+		dc_sample_value_t sample = {0};
+		sample.time = data;
+		garmin->callback(DC_SAMPLE_TTS, sample, garmin->userdata);
+	}
+}
 DECLARE_FIELD(RECORD, ndl, UINT32)			// s
 {
 	if (garmin->callback) {