diff --git a/docs/Settings.md b/docs/Settings.md
index 61195109625..f34552ec430 100644
--- a/docs/Settings.md
+++ b/docs/Settings.md
@@ -1162,6 +1162,16 @@ S.Port telemetry: Send pitch and roll degrees*10 instead of raw accelerometer da
 
 ---
 
+### frsky_use_legacy_gps_mode_sensor_ids
+
+S.Port telemetry: If `ON`, send the legacy telemetry IDs for modes (Tmp1) and GNSS (Tmp2). These are old IDs, deprecated, and will be removed in INAV 10.0. Tools and scripts using these IDs should be updated to use the new IDs of **470** for Modes and **480** for GNSS. Default: 'OFF'
+
+| Default | Min | Max |
+| --- | --- | --- |
+| OFF | OFF | ON |
+
+---
+
 ### fw_autotune_max_rate_deflection
 
 The target percentage of maximum mixer output used for determining the rates in `AUTO` and `LIMIT`.
diff --git a/docs/Telemetry.md b/docs/Telemetry.md
index 996630e66fa..46118e033d9 100644
--- a/docs/Telemetry.md
+++ b/docs/Telemetry.md
@@ -102,17 +102,21 @@ The following sensors are transmitted
 * **VSpd** : vertical speed, unit is cm/s.
 * **Hdg** : heading, North is 0°, South is 180°.
 * **AccX,Y,Z** : accelerometer values (not sent if `frsky_pitch_roll = ON`).
-* **Tmp1** : flight mode, sent as 5 digits. Number is sent as **ABCDE** detailed below. The numbers are additives (for example: if digit C is 6, it means both position hold and altitude hold are active) :
+* **470** : flight mode, sent as 5 digits. Number is sent as **ABCDE** detailed below. The numbers are additives (for example: if digit C is 6, it means both position hold and altitude hold are active) :
   * **A** : 1 = flaperon mode, 2 = auto tune mode, 4 = failsafe mode
   * **B** : 1 = return to home, 2 = waypoint mode, 4 = headfree mode
   * **C** : 1 = heading hold, 2 = altitude hold, 4 = position hold
   * **D** : 1 = angle mode, 2 = horizon mode, 4 = passthru mode
   * **E** : 1 = ok to arm, 2 = arming is prevented, 4 = armed
-* **Tmp2** : GPS lock status, accuracy, home reset trigger, and number of satellites. Number is sent as **ABCD** detailed below. Typical minimum GPS 3D lock value is 3906 (GPS locked and home fixed, HDOP highest accuracy, 6 satellites).
+  
+  _NOTE_ This sensor used to be **Tmp1**. The ID has been reassigned in INAV 8.0. The old ID of **Tmp1** can still be used, by using `set frsky_use_legacy_gps_mode_sensor_ids = ON`. This is deprecated and will be removed in INAV 10.0. All tools and scripts using the old IDs should be updated to use the new ID.
+* **480** : GPS lock status, accuracy, home reset trigger, and number of satellites. Number is sent as **ABCD** detailed below. Typical minimum GPS 3D lock value is 3906 (GPS locked and home fixed, HDOP highest accuracy, 6 satellites).
   * **A** : 1 = GPS fix, 2 = GPS home fix, 4 = home reset (numbers are additive)
   * **B** : GPS accuracy based on HDOP (0 = lowest to 9 = highest accuracy)
   * **C** : number of satellites locked (digit C & D are the number of locked satellites)
   * **D** : number of satellites locked (if 14 satellites are locked, C = 1 & D = 4)
+  
+  _NOTE_ This sensor used to be **Tmp2**. The ID has been reassigned in INAV 8.0. The old ID of **Tmp2** can still be used, by using `set frsky_use_legacy_gps_mode_sensor_ids = ON`. This is deprecated and will be removed in INAV 10.0. All tools and scripts using the old IDs should be updated to use the new ID.
 * **GAlt** : GPS altitude, sea level is zero.
 * **ASpd** : true air speed, from pitot sensor. This is _Knots * 10_
 * **A4** : average cell value. Warning : unlike FLVSS and MLVSS sensors, you do not get actual lowest value of a cell, but an average : (total lipo voltage) / (number of cells)
diff --git a/src/main/fc/settings.yaml b/src/main/fc/settings.yaml
index e3e69c7487f..6a82489718a 100644
--- a/src/main/fc/settings.yaml
+++ b/src/main/fc/settings.yaml
@@ -2986,6 +2986,10 @@ groups:
         description: "S.Port telemetry: Send pitch and roll degrees*10 instead of raw accelerometer data"
         default_value: OFF
         type: bool
+      - name: frsky_use_legacy_gps_mode_sensor_ids
+        description: "S.Port telemetry: If `ON`, send the legacy telemetry IDs for modes (Tmp1) and GNSS (Tmp2). These are old IDs, deprecated, and will be removed in INAV 10.0. Tools and scripts using these IDs should be updated to use the new IDs of **470** for Modes and **480** for GNSS. Default: 'OFF'"
+        default_value: OFF
+        type: bool
       - name: report_cell_voltage
         description: "S.Port and IBUS telemetry: Send the average cell voltage if set to ON"
         default_value: OFF
diff --git a/src/main/telemetry/smartport.c b/src/main/telemetry/smartport.c
index 9d804be52d8..94e318e8a7a 100755
--- a/src/main/telemetry/smartport.c
+++ b/src/main/telemetry/smartport.c
@@ -63,66 +63,68 @@
 // these data identifiers are obtained from https://github.com/opentx/opentx/blob/2.3/radio/src/telemetry/frsky.h
 enum
 {
-    FSSP_DATAID_SPEED      = 0x0830 ,
-    FSSP_DATAID_VFAS       = 0x0210 ,
-    FSSP_DATAID_CURRENT    = 0x0200 ,
-    FSSP_DATAID_RPM        = 0x050F ,
-    FSSP_DATAID_ALTITUDE   = 0x0100 ,
-    FSSP_DATAID_FUEL       = 0x0600 ,
-    FSSP_DATAID_ADC1       = 0xF102 ,
-    FSSP_DATAID_ADC2       = 0xF103 ,
-    FSSP_DATAID_LATLONG    = 0x0800 ,
-    FSSP_DATAID_CAP_USED   = 0x0600 ,
-    FSSP_DATAID_VARIO      = 0x0110 ,
-    FSSP_DATAID_CELLS      = 0x0300 ,
-    FSSP_DATAID_CELLS_LAST = 0x030F ,
-    FSSP_DATAID_HEADING    = 0x0840 ,
-    FSSP_DATAID_FPV        = 0x0450 ,
-    FSSP_DATAID_PITCH      = 0x0430 ,
-    FSSP_DATAID_ROLL       = 0x0440 ,
-    FSSP_DATAID_ACCX       = 0x0700 ,
-    FSSP_DATAID_ACCY       = 0x0710 ,
-    FSSP_DATAID_ACCZ       = 0x0720 ,
-    FSSP_DATAID_T1         = 0x0400 ,
-    FSSP_DATAID_T2         = 0x0410 ,
-    FSSP_DATAID_HOME_DIST  = 0x0420 ,
-    FSSP_DATAID_GPS_ALT    = 0x0820 ,
-    FSSP_DATAID_ASPD       = 0x0A00 ,
-    FSSP_DATAID_A3         = 0x0900 ,
-    FSSP_DATAID_A4         = 0x0910 ,
-    FSSP_DATAID_AZIMUTH    = 0x0460
+    FSSP_DATAID_SPEED           = 0x0830,
+    FSSP_DATAID_VFAS            = 0x0210,
+    FSSP_DATAID_CURRENT         = 0x0200,
+    FSSP_DATAID_RPM             = 0x050F,
+    FSSP_DATAID_ALTITUDE        = 0x0100,
+    FSSP_DATAID_FUEL            = 0x0600,
+    FSSP_DATAID_ADC1            = 0xF102,
+    FSSP_DATAID_ADC2            = 0xF103,
+    FSSP_DATAID_LATLONG         = 0x0800,
+    FSSP_DATAID_CAP_USED        = 0x0600,
+    FSSP_DATAID_VARIO           = 0x0110,
+    FSSP_DATAID_CELLS           = 0x0300,
+    FSSP_DATAID_CELLS_LAST      = 0x030F,
+    FSSP_DATAID_HEADING         = 0x0840,
+    FSSP_DATAID_FPV             = 0x0450,
+    FSSP_DATAID_PITCH           = 0x0430,
+    FSSP_DATAID_ROLL            = 0x0440,
+    FSSP_DATAID_ACCX            = 0x0700,
+    FSSP_DATAID_ACCY            = 0x0710,
+    FSSP_DATAID_ACCZ            = 0x0720,
+    FSSP_DATAID_LEGACY_MODES    = 0x0400, // Deprecated. Should be removed in INAV 10.0
+    FSSP_DATAID_LEGACY_GNSS     = 0x0410, // Deprecated. Should be removed in INAV 10.0
+    FSSP_DATAID_HOME_DIST       = 0x0420,
+    FSSP_DATAID_GPS_ALT         = 0x0820,
+    FSSP_DATAID_ASPD            = 0x0A00,
+    FSSP_DATAID_A3              = 0x0900,
+    FSSP_DATAID_A4              = 0x0910,
+    FSSP_DATAID_AZIMUTH         = 0x0460,
+    FSSP_DATAID_MODES           = 0x0470,
+    FSSP_DATAID_GNSS            = 0x0480,
 };
 
 const uint16_t frSkyDataIdTable[] = {
-    FSSP_DATAID_SPEED     ,
-    FSSP_DATAID_VFAS      ,
-    FSSP_DATAID_CURRENT   ,
-    //FSSP_DATAID_RPM       ,
-    FSSP_DATAID_ALTITUDE  ,
-    FSSP_DATAID_FUEL      ,
-    //FSSP_DATAID_ADC1      ,
-    //FSSP_DATAID_ADC2      ,
-    FSSP_DATAID_LATLONG   ,
-    FSSP_DATAID_LATLONG   , // twice
-    //FSSP_DATAID_CAP_USED  ,
-    FSSP_DATAID_VARIO     ,
-    //FSSP_DATAID_CELLS     ,
+    FSSP_DATAID_SPEED,
+    FSSP_DATAID_VFAS,
+    FSSP_DATAID_CURRENT,
+    //FSSP_DATAID_RPM,
+    FSSP_DATAID_ALTITUDE,
+    FSSP_DATAID_FUEL,
+    //FSSP_DATAID_ADC1,
+    //FSSP_DATAID_ADC2,
+    FSSP_DATAID_LATLONG,
+    FSSP_DATAID_LATLONG, // twice
+    //FSSP_DATAID_CAP_USED,
+    FSSP_DATAID_VARIO,
+    //FSSP_DATAID_CELLS,
     //FSSP_DATAID_CELLS_LAST,
-    FSSP_DATAID_HEADING   ,
-    FSSP_DATAID_FPV       ,
-    FSSP_DATAID_PITCH     ,
-    FSSP_DATAID_ROLL      ,
-    FSSP_DATAID_ACCX      ,
-    FSSP_DATAID_ACCY      ,
-    FSSP_DATAID_ACCZ      ,
-    FSSP_DATAID_T1        ,
-    FSSP_DATAID_T2        ,
-    FSSP_DATAID_HOME_DIST ,
-    FSSP_DATAID_GPS_ALT   ,
-    FSSP_DATAID_ASPD      ,
-    // FSSP_DATAID_A3        ,
-    FSSP_DATAID_A4        ,
-    FSSP_DATAID_AZIMUTH ,
+    FSSP_DATAID_HEADING,
+    FSSP_DATAID_FPV,
+    FSSP_DATAID_PITCH,
+    FSSP_DATAID_ROLL,
+    FSSP_DATAID_ACCX,
+    FSSP_DATAID_ACCY,
+    FSSP_DATAID_ACCZ,
+    FSSP_DATAID_MODES,
+    FSSP_DATAID_GNSS,
+    FSSP_DATAID_HOME_DIST,
+    FSSP_DATAID_GPS_ALT,
+    FSSP_DATAID_ASPD,
+    // FSSP_DATAID_A3,
+    FSSP_DATAID_A4,
+    FSSP_DATAID_AZIMUTH,
     0
 };
 
@@ -467,27 +469,27 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
         smartPortIdCnt++;
 
         switch (id) {
-            case FSSP_DATAID_VFAS       :
+            case FSSP_DATAID_VFAS:
                 if (isBatteryVoltageConfigured()) {
                     uint16_t vfasVoltage = telemetryConfig()->report_cell_voltage ? getBatteryAverageCellVoltage() : getBatteryVoltage();
                     smartPortSendPackage(id, vfasVoltage);
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_CURRENT    :
+            case FSSP_DATAID_CURRENT:
                 if (isAmperageConfigured()) {
                     smartPortSendPackage(id, getAmperage() / 10); // given in 10mA steps, unknown requested unit
                     *clearToSend = false;
                 }
                 break;
-            //case FSSP_DATAID_RPM        :
-            case FSSP_DATAID_ALTITUDE   :
+            //case FSSP_DATAID_RPM:
+            case FSSP_DATAID_ALTITUDE:
                 if (sensors(SENSOR_BARO)) {
                     smartPortSendPackage(id, getEstimatedActualPosition(Z)); // unknown given unit, requested 100 = 1 meter
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_FUEL       :
+            case FSSP_DATAID_FUEL:
                 if (telemetryConfig()->smartportFuelUnit == SMARTPORT_FUEL_UNIT_PERCENT) {
                     smartPortSendPackage(id, calculateBatteryPercentage()); // Show remaining battery % if smartport_fuel_percent=ON
                     *clearToSend = false;
@@ -496,63 +498,71 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
                     *clearToSend = false;
                 }
                 break;
-            //case FSSP_DATAID_ADC1       :
-            //case FSSP_DATAID_ADC2       :
-            //case FSSP_DATAID_CAP_USED   :
-            case FSSP_DATAID_VARIO      :
+            //case FSSP_DATAID_ADC1:
+            //case FSSP_DATAID_ADC2:
+            //case FSSP_DATAID_CAP_USED:
+            case FSSP_DATAID_VARIO:
                 if (sensors(SENSOR_BARO)) {
                     smartPortSendPackage(id, lrintf(getEstimatedActualVelocity(Z))); // unknown given unit but requested in 100 = 1m/s
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_HEADING    :
+            case FSSP_DATAID_HEADING:
                 smartPortSendPackage(id, attitude.values.yaw * 10); // given in 10*deg, requested in 10000 = 100 deg
                 *clearToSend = false;
                 break;
-            case FSSP_DATAID_PITCH      :
+            case FSSP_DATAID_PITCH:
                 if (telemetryConfig()->frsky_pitch_roll) {
                     smartPortSendPackage(id, attitude.values.pitch); // given in 10*deg
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_ROLL       :
+            case FSSP_DATAID_ROLL:
                 if (telemetryConfig()->frsky_pitch_roll) {
                     smartPortSendPackage(id, attitude.values.roll); // given in 10*deg
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_ACCX       :
+            case FSSP_DATAID_ACCX:
                 if (!telemetryConfig()->frsky_pitch_roll) {
                     smartPortSendPackage(id, lrintf(100 * acc.accADCf[X]));
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_ACCY       :
+            case FSSP_DATAID_ACCY:
                 if (!telemetryConfig()->frsky_pitch_roll) {
                     smartPortSendPackage(id, lrintf(100 * acc.accADCf[Y]));
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_ACCZ       :
+            case FSSP_DATAID_ACCZ:
                 if (!telemetryConfig()->frsky_pitch_roll) {
                     smartPortSendPackage(id, lrintf(100 * acc.accADCf[Z]));
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_T1         :
+            case FSSP_DATAID_MODES:
                 {
+                    if (telemetryConfig()->frsky_use_legacy_gps_mode_sensor_ids)
+                        id = FSSP_DATAID_LEGACY_MODES;
+
                     smartPortSendPackage(id, frskyGetFlightMode());
                     *clearToSend = false;
                     break;
                 }
 #ifdef USE_GPS
-            case FSSP_DATAID_T2         :
-                if (smartPortShouldSendGPSData()) {
-                    smartPortSendPackage(id, frskyGetGPSState());
-                    *clearToSend = false;
+            case FSSP_DATAID_GNSS:
+                {
+                    if (telemetryConfig()->frsky_use_legacy_gps_mode_sensor_ids)
+                        id = FSSP_DATAID_LEGACY_GNSS;
+
+                    if (smartPortShouldSendGPSData()) {
+                        smartPortSendPackage(id, frskyGetGPSState());
+                        *clearToSend = false;
+                    }
+                    break;
                 }
-                break;
-            case FSSP_DATAID_SPEED      :
+            case FSSP_DATAID_SPEED:
                 if (smartPortShouldSendGPSData()) {
                     //convert to knots: 1cm/s = 0.0194384449 knots
                     //Speed should be sent in knots/1000 (GPS speed is in cm/s)
@@ -561,7 +571,7 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_LATLONG    :
+            case FSSP_DATAID_LATLONG:
                 if (smartPortShouldSendGPSData()) {
                     uint32_t tmpui = 0;
                     // the same ID is sent twice, one for longitude, one for latitude
@@ -581,25 +591,25 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_HOME_DIST  :
+            case FSSP_DATAID_HOME_DIST:
                 if (smartPortShouldSendGPSData()) {
                     smartPortSendPackage(id, GPS_distanceToHome);
                      *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_GPS_ALT    :
+            case FSSP_DATAID_GPS_ALT:
                 if (smartPortShouldSendGPSData()) {
                     smartPortSendPackage(id, gpsSol.llh.alt); // cm
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_FPV       :
+            case FSSP_DATAID_FPV:
                 if (smartPortShouldSendGPSData()) {
                     smartPortSendPackage(id, gpsSol.groundCourse); // given in 10*deg
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_AZIMUTH    :
+            case FSSP_DATAID_AZIMUTH:
                 if (smartPortShouldSendGPSData()) {
                     int16_t h = GPS_directionToHome;
                     if (h < 0) {
@@ -614,13 +624,13 @@ void processSmartPortTelemetry(smartPortPayload_t *payload, volatile bool *clear
                 }
                 break;
 #endif
-            case FSSP_DATAID_A4         :
+            case FSSP_DATAID_A4:
                 if (isBatteryVoltageConfigured()) {
                     smartPortSendPackage(id, getBatteryAverageCellVoltage());
                     *clearToSend = false;
                 }
                 break;
-            case FSSP_DATAID_ASPD       :
+            case FSSP_DATAID_ASPD:
 #ifdef USE_PITOT
                 if (sensors(SENSOR_PITOT) && pitotIsHealthy()) {
                     smartPortSendPackage(id, getAirspeedEstimate() * 0.194384449f); // cm/s to knots*1
diff --git a/src/main/telemetry/telemetry.c b/src/main/telemetry/telemetry.c
index d6c8e355d86..26f9631a89d 100644
--- a/src/main/telemetry/telemetry.c
+++ b/src/main/telemetry/telemetry.c
@@ -59,6 +59,7 @@ PG_RESET_TEMPLATE(telemetryConfig_t, telemetryConfig,
     .telemetry_switch = SETTING_TELEMETRY_SWITCH_DEFAULT,
     .telemetry_inverted = SETTING_TELEMETRY_INVERTED_DEFAULT,
     .frsky_pitch_roll = SETTING_FRSKY_PITCH_ROLL_DEFAULT,
+    .frsky_use_legacy_gps_mode_sensor_ids = SETTING_FRSKY_USE_LEGACY_GPS_MODE_SENSOR_IDS_DEFAULT,
     .report_cell_voltage = SETTING_REPORT_CELL_VOLTAGE_DEFAULT,
     .hottAlarmSoundInterval = SETTING_HOTT_ALARM_SOUND_INTERVAL_DEFAULT,
     .halfDuplex = SETTING_TELEMETRY_HALFDUPLEX_DEFAULT,
diff --git a/src/main/telemetry/telemetry.h b/src/main/telemetry/telemetry.h
index c7edad973b8..7be5e50a9ce 100644
--- a/src/main/telemetry/telemetry.h
+++ b/src/main/telemetry/telemetry.h
@@ -46,6 +46,7 @@ typedef struct telemetryConfig_s {
     uint8_t telemetry_switch;               // Use aux channel to change serial output & baudrate( MSP / Telemetry ). It disables automatic switching to Telemetry when armed.
     uint8_t telemetry_inverted;             // Flip the default inversion of the protocol - Same as serialrx_inverted in rx.c, but for telemetry.
     uint8_t frsky_pitch_roll;
+    bool    frsky_use_legacy_gps_mode_sensor_ids;
     uint8_t report_cell_voltage;
     uint8_t hottAlarmSoundInterval;
     uint8_t halfDuplex;
