diff --git a/suunto_common.c b/suunto_common.c
new file mode 100644
index 0000000..136bb96
--- /dev/null
+++ b/suunto_common.c
@@ -0,0 +1,74 @@
+#include <assert.h>
+#include <string.h>
+
+#include "suunto_common.h"
+
+#define SUBSTRACT(a, x, begin, end) substract (a - begin, x, end - begin) + begin
+#define DISTANCE(a, b, begin, end) distance (a, b, end - begin)
+
+static unsigned int
+substract (unsigned int a, unsigned int x, unsigned int size)
+{
+	if (x <= a) {
+		return (a - x) % size;
+	} else {
+		return size - (x - a) % size;
+	}
+}
+
+static unsigned int
+distance (unsigned int a, unsigned int b, unsigned int size)
+{
+	if (a <= b) {
+		return (b - a) % size;
+	} else {
+		return size - (a - b) % size;
+	}
+}
+
+int
+suunto_common_extract_dives (const unsigned char data[], unsigned int begin, unsigned int end, unsigned int eop, unsigned int peek, dive_callback_t callback, void *userdata)
+{
+	assert (eop >= begin && eop < end);
+	assert (data[eop] == 0x82);
+
+	unsigned char buffer[0x2000 - 0x4C] = {0};
+	assert (sizeof (buffer) >= end - begin);
+
+	unsigned int current = eop;
+	unsigned int previous = eop;
+	for (unsigned int i = 0; i < end - begin; ++i) {
+		// Move backwards through the ringbuffer.
+		if (current == begin)
+			current = end;
+		current--;
+
+		// Check for an end of profile marker.
+		if (data[current] == 0x82)
+			break;
+
+		// Check for an end of dive marker (of the next dive),
+		// to find the start of the current dive.
+		unsigned int peek = SUBSTRACT (current, peek, begin, end);
+		if (data[peek] == 0x80) {
+			unsigned int len = DISTANCE (current, previous, begin, end);
+			if (current + len > end) {
+				unsigned int a = end - current;
+				unsigned int b = (current + len) - end;
+				memcpy (buffer + 0, data + current, a);
+				memcpy (buffer + a, data + begin,   b);
+			} else {
+				memcpy (buffer, data + current, len);
+			}
+
+			if (callback)
+				callback (buffer, len, userdata);
+
+			previous = current;
+		}
+	}
+
+	assert (data[current] == 0x82);
+
+	return SUUNTO_SUCCESS;
+}
diff --git a/suunto_common.h b/suunto_common.h
new file mode 100644
index 0000000..6d223dc
--- /dev/null
+++ b/suunto_common.h
@@ -0,0 +1,15 @@
+#ifndef SUUNTO_COMMON_H
+#define SUUNTO_COMMON_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+#include "suunto.h"
+
+int suunto_common_extract_dives (const unsigned char data[], unsigned int begin, unsigned int end, unsigned int eop, unsigned int peek, dive_callback_t callback, void *userdata);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif /* SUUNTO_COMMON_H */
diff --git a/suunto_eon.c b/suunto_eon.c
index 733a67d..0d5a416 100644
--- a/suunto_eon.c
+++ b/suunto_eon.c
@@ -1,7 +1,9 @@
 #include <string.h> // memcmp, memcpy
 #include <stdlib.h> // malloc, free
+#include <assert.h> // assert
 
 #include "suunto.h"
+#include "suunto_common.h"
 #include "serial.h"
 #include "utils.h"
 
@@ -184,3 +186,21 @@ suunto_eon_write_interval (eon *device, unsigned char interval)
 
 	return SUUNTO_SUCCESS;
 }
+
+
+int
+suunto_eon_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata)
+{
+	assert (size >= SUUNTO_EON_MEMORY_SIZE);
+
+	// Search the end-of-profile marker.
+	unsigned int eop = 0x100;
+	while (eop < SUUNTO_EON_MEMORY_SIZE) {
+		if (data[eop] == 0x82) {
+			break;
+		}
+		eop++;
+	}
+
+	return suunto_common_extract_dives (data, 0x100, SUUNTO_EON_MEMORY_SIZE, eop, 3, callback, userdata);
+}
diff --git a/suunto_eon.h b/suunto_eon.h
index 9457a01..77e3fd4 100644
--- a/suunto_eon.h
+++ b/suunto_eon.h
@@ -19,6 +19,8 @@ int suunto_eon_write_name (eon *device, unsigned char data[], unsigned int size)
 
 int suunto_eon_write_interval (eon *device, unsigned char interval);
 
+int suunto_eon_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */
diff --git a/suunto_vyper.c b/suunto_vyper.c
index 9273ea7..0a404c2 100644
--- a/suunto_vyper.c
+++ b/suunto_vyper.c
@@ -3,6 +3,7 @@
 #include <assert.h>	// assert
 
 #include "suunto.h"
+#include "suunto_common.h"
 #include "serial.h"
 #include "utils.h"
 
@@ -533,3 +534,25 @@ suunto_vyper_read_dives (vyper *device, dive_callback_t callback, void *userdata
 
 	return SUUNTO_SUCCESS;
 }
+
+
+int
+suunto_vyper_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata)
+{
+	assert (size >= SUUNTO_VYPER_MEMORY_SIZE);
+
+	unsigned int eop = (data[0x51] << 8) + data[0x52];
+
+	return suunto_common_extract_dives (data, 0x71, SUUNTO_VYPER_MEMORY_SIZE, eop, 5, callback, userdata);
+}
+
+
+int
+suunto_spyder_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata)
+{
+	assert (size >= SUUNTO_VYPER_MEMORY_SIZE);
+
+	unsigned int eop = (data[0x1C] << 8) + data[0x1D];
+
+	return suunto_common_extract_dives (data, 0x4C, SUUNTO_VYPER_MEMORY_SIZE, eop, 3, callback, userdata);
+}
diff --git a/suunto_vyper.h b/suunto_vyper.h
index 659baf1..cd1abcf 100644
--- a/suunto_vyper.h
+++ b/suunto_vyper.h
@@ -26,6 +26,10 @@ int suunto_vyper_write_memory (vyper *device, unsigned int address, const unsign
 
 int suunto_vyper_read_dives (vyper *device, dive_callback_t callback, void *userdata);
 
+int suunto_vyper_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata);
+
+int suunto_spyder_extract_dives (const unsigned char data[], unsigned int size, dive_callback_t callback, void *userdata);
+
 #ifdef __cplusplus
 }
 #endif /* __cplusplus */