diff --git a/src/descriptor.c b/src/descriptor.c
index c434721..73f9e62 100644
--- a/src/descriptor.c
+++ b/src/descriptor.c
@@ -239,6 +239,7 @@ static const dc_descriptor_t g_descriptors[] = {
 	{"Aqualung", "i300C",               DC_FAMILY_OCEANIC_ATOM2, 0x4648, DC_TRANSPORT_SERIAL, NULL},
 	{"Aqualung", "i100",                DC_FAMILY_OCEANIC_ATOM2, 0x464E, DC_TRANSPORT_SERIAL, NULL},
 	{"Aqualung", "i770R",               DC_FAMILY_OCEANIC_ATOM2, 0x4651, DC_TRANSPORT_SERIAL, NULL},
+	{"Aqualung", "i550C",               DC_FAMILY_OCEANIC_ATOM2, 0x4652, DC_TRANSPORT_SERIAL, NULL},
 	/* Mares Nemo */
 	{"Mares", "Nemo",         DC_FAMILY_MARES_NEMO, 0, DC_TRANSPORT_SERIAL, NULL},
 	{"Mares", "Nemo Steel",   DC_FAMILY_MARES_NEMO, 0, DC_TRANSPORT_SERIAL, NULL},
diff --git a/src/oceanic_atom2.c b/src/oceanic_atom2.c
index 33947bd..8aed308 100644
--- a/src/oceanic_atom2.c
+++ b/src/oceanic_atom2.c
@@ -159,6 +159,7 @@ static const oceanic_common_version_t oceanic_oc1_version[] = {
 	{"OC1WATCH \0\0 1024"},
 	{"OCSWATCH \0\0 1024"},
 	{"AQUAI550 \0\0 1024"},
+	{"AQUA550C \0\0 1024"},
 };
 
 static const oceanic_common_version_t oceanic_oci_version[] = {
diff --git a/src/oceanic_atom2_parser.c b/src/oceanic_atom2_parser.c
index 6113b6f..da2ba0f 100644
--- a/src/oceanic_atom2_parser.c
+++ b/src/oceanic_atom2_parser.c
@@ -90,6 +90,7 @@
 #define I300C       0x4648
 #define I100        0x464E
 #define I770R       0x4651
+#define I550C       0x4652
 
 #define NORMAL   0
 #define GAUGE    1
@@ -182,6 +183,8 @@ oceanic_atom2_parser_create (dc_parser_t **out, dc_context_t *context, unsigned
 		parser->headersize = 5 * PAGESIZE;
 	} else if (model == PROPLUSX) {
 		parser->headersize = 3 * PAGESIZE;
+	} else if (model == I550C) {
+		parser->headersize = 5 * PAGESIZE / 2;
 	}
 
 	parser->cached = 0;
@@ -256,6 +259,7 @@ oceanic_atom2_parser_get_datetime (dc_parser_t *abstract, dc_datetime_t *datetim
 		case A300AI:
 		case OCI:
 		case I550:
+		case I550C:
 		case VISION:
 		case XPAIR:
 			datetime->year   = ((p[5] & 0xE0) >> 5) + ((p[7] & 0xE0) >> 2) + 2000;
@@ -888,7 +892,7 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 				} else {
 					unsigned int sign;
 					if (parser->model == DG03 || parser->model == PROPLUS3 ||
-						parser->model == I550)
+						parser->model == I550 || parser->model == I550C)
 						sign = (~data[offset + 5] & 0x04) >> 2;
 					else if (parser->model == VOYAGER2G || parser->model == AMPHOS ||
 						parser->model == AMPHOSAIR || parser->model == ZENAIR)
@@ -920,7 +924,8 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 					parser->model == ZENAIR ||parser->model == A300AI ||
 					parser->model == DG03 || parser->model == PROPLUS3 ||
 					parser->model == AMPHOSAIR || parser->model == I550 ||
-					parser->model == VISION || parser->model == XPAIR)
+					parser->model == VISION || parser->model == XPAIR ||
+					parser->model == I550C)
 					pressure = (((data[offset + 0] & 0x03) << 8) + data[offset + 1]) * 5;
 				else if (parser->model == TX1 || parser->model == A300CS ||
 					parser->model == VTX || parser->model == I750TC ||
@@ -987,7 +992,8 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 				decotime = array_uint16_le(data + offset + 6);
 				have_deco = 1;
 			} else if (parser->model == ATOM31 || parser->model == VISION ||
-				parser->model == XPAIR || parser->model == I550) {
+				parser->model == XPAIR || parser->model == I550 ||
+				parser->model == I550C) {
 				decostop = (data[offset + 5] & 0xF0) >> 4;
 				decotime = array_uint16_le(data + offset + 4) & 0x03FF;
 				have_deco = 1;
@@ -1024,7 +1030,7 @@ oceanic_atom2_parser_samples_foreach (dc_parser_t *abstract, dc_sample_callback_
 				rbt = array_uint16_le(data + offset + 8) & 0x01FF;
 				have_rbt = 1;
 			} else if (parser->model == VISION || parser->model == XPAIR ||
-				parser->model == I550) {
+				parser->model == I550 || parser->model == I550C) {
 				rbt = array_uint16_le(data + offset + 6) & 0x03FF;
 				have_rbt = 1;
 			}