diff --git a/lib/include/libv4l2rds.h b/lib/include/libv4l2rds.h
index 62b28bc..45dc2d1 100644
--- a/lib/include/libv4l2rds.h
+++ b/lib/include/libv4l2rds.h
@@ -50,6 +50,10 @@ extern "C" {
 			* Additional data is limited to 112 bit, and the smallest
 			* optional tuple has a size of 4 bit (4 bit identifier +
 			* 0 bits of data) */
+#define MAX_TMC_ALT_STATIONS 32 /* defined by ISO 14819-1:2003, 7.5.3.3  */
+#define MAX_TMC_AF_CNT 4	/* limit for the numbers of AFs stored per alternative TMC
+			* station. This value is not defined by the standard, but based on observation
+			* of real-world RDS-TMC streams */
 #define MAX_EON_CNT 20	/* Maximal number of entries in the EON table (for storing
 			* information about other radio stations, broadcasted
 			* by the current station) */
@@ -75,6 +79,7 @@ extern "C" {
 #define V4L2_RDS_TMC_SYS	0x10000	/* RDS-TMC system information */
 #define V4L2_RDS_EON		0x20000	/* Enhanced Other Network Info */
 #define V4L2_RDS_LSF		0x40000	/* Linkage information */
+#define V4L2_RDS_TMC_TUNING	0x80000	/* RDS-TMC tuning information */
 
 /* Define Constants for the state of the RDS decoding process
  * used to address the relevant bit in the decode_information bitmask */
@@ -175,6 +180,37 @@ struct v4l2_rds_eon_set {
 						 * radio channels */
 };
 
+/* struct to encapsulate alternative frequencies (AFs) for RDS-TMC stations.
+ * AFs listed in af[] can be used unconditionally. 
+ * AFs listed in mapped_af[n] should only be used if the current 
+ * tuner frequency matches the value in mapped_af_tuning[n] */
+struct v4l2_tmc_alt_freq {
+	uint8_t af_size;		/* number of known AFs */
+	uint8_t af_index;
+	uint8_t mapped_af_size;		/* number of mapped AFs */
+	uint8_t mapped_af_index;
+	uint32_t af[MAX_TMC_AF_CNT];		/* AFs defined in Hz */
+	uint32_t mapped_af[MAX_TMC_AF_CNT];		/* mapped AFs defined in Hz */
+	uint32_t mapped_af_tuning[MAX_TMC_AF_CNT];	/* mapped AFs defined in Hz */
+};
+
+/* struct to encapsulate information about stations carrying RDS-TMC services */
+struct v4l2_tmc_station {
+	uint16_t pi;
+	uint8_t ltn;	/* database-ID of ON */
+	uint8_t msg;	/* msg parameters of ON */
+	uint8_t sid;	/* service-ID of ON */
+	struct v4l2_tmc_alt_freq afi;
+};
+
+/* struct to encapsulate tuning information for TMC */
+struct v4l2_tmc_tuning {
+	uint8_t station_cnt;	/* number of announced alternative stations */
+	uint8_t index;
+	struct v4l2_tmc_station station[MAX_TMC_ALT_STATIONS];	/* information
+							* about other stations carrying the same RDS-TMC service */
+};
+
 /* struct to encapsulate an additional data field in a TMC message */
 struct v4l2_tmc_additional {
 	uint8_t label;
@@ -225,6 +261,9 @@ struct v4l2_rds_tmc {
 	uint8_t t_d;		/* delay time (only if mode = enhanced */
 	uint8_t spn[9];		/* service provider name */
 	struct v4l2_rds_tmc_msg tmc_msg;
+
+	/* tuning information for alternative service providers */
+	struct v4l2_tmc_tuning tuning;
 };
 
 /* struct to encapsulate state and RDS information for current decoding process */
diff --git a/lib/libv4l2rds/libv4l2rds.c b/lib/libv4l2rds/libv4l2rds.c
index 3a90a3b..3995c3d 100644
--- a/lib/libv4l2rds/libv4l2rds.c
+++ b/lib/libv4l2rds/libv4l2rds.c
@@ -93,7 +93,9 @@ enum rds_state {
 };
 
 /* function declarations to prevent the need to move large code blocks */
+static int rds_add_tmc_station(struct rds_private_state *priv_state, uint16_t pi);
 static uint32_t rds_decode_af(uint8_t af, bool is_vhf);
+static bool rds_add_tmc_af(struct rds_private_state *priv_state);
 
 static inline uint8_t set_bit(uint8_t input, uint8_t bitmask, bool bitvalue)
 {
@@ -437,6 +439,59 @@ static uint32_t rds_decode_tmc_multi_group(struct rds_private_state *priv_state)
 	return V4L2_RDS_TMC_MG;
 }
 
+/* decode the RDS-TMC tuning information that is contained in type 8A groups
+ * (variants 4 to 9) that announce the presence alternative transmitters 
+ * providing the same RDS-TMC service */
+static uint32_t rds_decode_tmc_tuning(struct rds_private_state *priv_state)
+{
+	struct v4l2_rds_group *group = &priv_state->rds_group;
+	struct v4l2_rds_tmc *tmc = &priv_state->handle.tmc;
+	uint8_t variant_code = group->data_b_lsb & 0x0f;
+	uint16_t pi_on = (group->data_d_msb << 8) | group->data_d_lsb;
+	uint8_t index;
+
+	/* variants 4 and 5 carry the service provider name */
+	if (variant_code >= 4 && variant_code <= 5) {
+		int offset = 4 * (variant_code - 4);
+		tmc->spn[0 + offset] = group->data_c_msb;
+		tmc->spn[1 + offset] = group->data_c_lsb;
+		tmc->spn[2 + offset] = group->data_d_msb;
+		tmc->spn[3 + offset] = group->data_d_lsb;
+
+	/* variant 6 provides specific frequencies for the same RDS-TMC service
+	 * on a network with a different PI code */
+	/* variant 7 provides mapped frequency pair information which should only
+	 * be used if the terminal is tuned to the tuning frequency */
+	} else if (variant_code == 6 || variant_code == 7) {
+		rds_add_tmc_af(priv_state);
+
+	/* variant 8 indicates up to 2 PI codes of adjacent networks carrying 
+	 * the same RDS-TMC service on all transmitters of the network */ 
+	} else if (variant_code == 8) {
+		uint16_t pi_on_2 = (group->data_c_msb << 8) | group->data_c_lsb;
+
+		/* try to add both transmitted PI codes to the table */
+		rds_add_tmc_station(priv_state, pi_on);
+		/* PI = 0 is used as a filler code */
+		if (pi_on_2 != 0) rds_add_tmc_station(priv_state, pi_on_2);
+
+	/* variant 9 provides PI codes of other networks with different system 
+	 * parameters */
+	} else if (variant_code == 9) {
+		index = rds_add_tmc_station(priv_state, pi_on);
+
+		/* bits 0 - 5 contain the service-ID of the ON */
+		tmc->tuning.station[index].sid = group->data_c_lsb & 0x3F;
+		/* bits 6-10 contain the msg parameters of the ON */
+		tmc->tuning.station[index].msg = (group->data_c_msb & 0x03) << 2;
+		tmc->tuning.station[index].msg |= (group->data_c_lsb >> 6) & 0x03;
+		/* bits 11-15 contain the database-ID of the ON */
+		tmc->tuning.station[index].ltn = group->data_c_msb >> 2;
+	}
+
+	return V4L2_RDS_TMC_TUNING;
+}
+
 static bool rds_add_oda(struct rds_private_state *priv_state, struct v4l2_rds_oda oda)
 {
 	struct v4l2_rds *handle = &priv_state->handle;
@@ -516,6 +571,103 @@ static bool rds_add_af(struct rds_private_state *priv_state)
 	return updated_af;
 }
 
+/* checks if an entry for the given PI already exists and returns the index
+ * of that entry if so. Else it adds a new entry to the TMC-Tuning table and returns
+ * the index of the new field */
+static int rds_add_tmc_station(struct rds_private_state *priv_state, uint16_t pi)
+{
+	struct v4l2_tmc_tuning *tuning = &priv_state->handle.tmc.tuning;
+	uint8_t index = tuning->index;
+	uint8_t size = tuning->station_cnt;
+	
+	/* check if there's an entry for the given PI key */
+	for (int i = 0; i < tuning->station_cnt; i++) {
+		if (tuning->station[i].pi == pi) {
+			return i;
+		}
+	}
+	/* if the the maximum table size is reached, overwrite old
+	 * entries, starting at the oldest one = 0 */
+	tuning->station[index].pi = pi;
+	tuning->index = (index+1 < MAX_TMC_ALT_STATIONS)? (index+1) : 0;
+	tuning->station_cnt = (size+1 <= MAX_TMC_ALT_STATIONS)? (size+1) : MAX_TMC_ALT_STATIONS;
+	return index;
+}
+
+/* tries to add new AFs to the relevant entry in the list of RDS-TMC providers */
+static bool rds_add_tmc_af(struct rds_private_state *priv_state)
+{
+	struct v4l2_rds_group *grp = &priv_state->rds_group;
+	struct v4l2_tmc_alt_freq *afi;
+	uint16_t pi_on = grp->data_d_msb << 8 | grp->data_d_lsb;
+	uint8_t variant = grp->data_b_lsb & 0x0f;
+	uint8_t station_index = rds_add_tmc_station(priv_state, pi_on);
+	uint8_t af_index;
+	uint8_t mapped_af_index;
+	uint32_t freq_a = rds_decode_af(grp->data_c_msb, true);
+	uint32_t freq_b = rds_decode_af(grp->data_c_lsb, true);
+	
+	afi = &priv_state->handle.tmc.tuning.station[station_index].afi;
+	af_index = afi->af_index;
+	mapped_af_index = afi->mapped_af_index;
+
+	/* specific frequencies */
+	if (variant == 6) {
+		/* compare the new AFs to the stored ones, reset them to 0 if the AFs are
+		 * already known */
+		for (int i = 0; i < afi->af_size; i++) {
+			freq_a = (freq_a == afi->af[i])? 0 : freq_a;
+			freq_b = (freq_b == afi->af[i])? 0 : freq_b;
+		}
+		/* return early if there is nothing to do */
+		if (freq_a == 0 && freq_b == 0)
+			return false;
+
+		/* add the new AFs if they were previously unknown */
+		if (freq_a != 0) {
+			afi->af[af_index] = freq_a;
+			af_index = (af_index+1 < MAX_TMC_AF_CNT)? af_index+1 : 0;
+			afi->af_size++; 
+		}
+		if (freq_b != 0) {
+			afi->af[af_index] = freq_b;
+			af_index = (af_index+1 < MAX_TMC_AF_CNT)? af_index+1 : 0;
+			afi->af_size++; 
+		}
+		/* update the information in the handle */
+		afi->af_index = af_index;
+		if (afi->af_size >= MAX_TMC_AF_CNT) 
+			afi->af_size = MAX_TMC_AF_CNT;
+
+		return true;
+	}
+
+	/* mapped frequency pair */
+	else if (variant == 7) {
+		/* check the if there's already a frequency mapped to the new tuning
+		 * frequency, update the mapped frequency in this case */
+		for (int i = 0; i < afi->mapped_af_size; i++) {
+			if (freq_a == afi->mapped_af_tuning[i])
+				afi->mapped_af[i] = freq_b;
+				return true;
+		}
+		/* new pair is unknown, add it to the list */
+		if (freq_a != 0 && freq_b != 0) {
+			mapped_af_index = (mapped_af_index+1 >= MAX_TMC_AF_CNT)? 0 : mapped_af_index + 1;
+			afi->mapped_af[mapped_af_index] = freq_b;
+			afi->mapped_af_tuning[mapped_af_index] = freq_a;
+			afi->mapped_af_size++; 
+		}
+		/* update the information in the handle */
+		afi->mapped_af_index = mapped_af_index;
+		if (afi->mapped_af_size >= MAX_TMC_AF_CNT) 
+			afi->mapped_af_size = MAX_TMC_AF_CNT;
+
+		return true;
+	}
+	return false;
+}
+
 /* adds one char of the ps name to temporal storage, the value is validated
  * if it is received twice in a row
  * @pos:	position of the char within the PS name (0..7)
@@ -968,13 +1120,12 @@ static uint32_t rds_decode_group8(struct rds_private_state *priv_state)
 		!(grp->data_b_lsb & V4L2_TMC_TUNING_INFO)) {
 		return rds_decode_tmc_multi_group(priv_state);
 	}
-	/* -> tuning information message, defined for variants 4..9, submitted
-	 * in bits 0-3 of block 2 */
+	/* -> tuning information message, defined for variants 4..9,
+	 * submitted in bits 0-3 of block 2 */
 	tuning_variant = grp->data_b_lsb & 0x0f;
 	if ((grp->data_b_lsb & V4L2_TMC_TUNING_INFO) && tuning_variant >= 4 &&
 		tuning_variant <= 9) {
-		/* TODO: Implement tuning information decoding */
-		return 0;
+		return rds_decode_tmc_tuning(priv_state);
 	}
 
 	return 0;
