# HG changeset patch
# User heinrichsweikamp
# Date 1684739709 -7200
# Node ID 74253a41cf80fc51d668c10a6fcf7361be88826e
# Parent  6a8cf91e5b22b42d2b23c02dfd31b4d70b46e1d8# Parent  45b8f3c2acce651fd608b3530f54cdeefefde6b7
Zusammenf?hren

diff -r 6a8cf91e5b22 -r 74253a41cf80 Common/Inc/data_central.h
--- a/Common/Inc/data_central.h	Mon May 22 09:14:27 2023 +0200
+++ b/Common/Inc/data_central.h	Mon May 22 09:15:09 2023 +0200
@@ -28,6 +28,7 @@
 #define DATA_CENTRAL_H
 
 #include <stdint.h>
+#include <stdbool.h>
 
 #include "settings.h"
 #include "stm32f4xx_hal.h"
@@ -502,5 +503,6 @@
 
 uint8_t isLoopMode(uint8_t Mode);
 
+bool isCompassCalibrated(void);
 void setCompassHeading(uint16_t heading);
 #endif // DATA_CENTRAL_H
diff -r 6a8cf91e5b22 -r 74253a41cf80 Common/Inc/settings.h
--- a/Common/Inc/settings.h	Mon May 22 09:14:27 2023 +0200
+++ b/Common/Inc/settings.h	Mon May 22 09:15:09 2023 +0200
@@ -86,7 +86,7 @@
 
 #define UART_MAX_PROTOCOL		(2u)
 
-#define FUTURE_SPARE_SIZE		(4u)		/* Applied for reuse of old, not used, scooter block (was 32 bytes)*/
+#define FUTURE_SPARE_SIZE		(3u)		/* Applied for reuse of old, not used, scooter block (was 32 bytes)*/
 
 typedef enum
 {
@@ -237,6 +237,7 @@
 	SScrubberData scrubberData[2];
 	uint8_t ext_sensor_map[5];
 	uint8_t buttonLockActive;										/* redefined in 0xFFFF0025 */
+	int8_t compassDeclinationDeg;										/* redefined in 0xFFFF0026 */
 	uint8_t Future_SPARE[FUTURE_SPARE_SIZE];					/* redefined in 0xFFFF0020 (old scooter Block was 32 byte)*/
 	// new in 0xFFFF0006
 	uint8_t ppo2sensors_deactivated;
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Inc/base.h
--- a/Discovery/Inc/base.h	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Inc/base.h	Mon May 22 09:15:09 2023 +0200
@@ -109,6 +109,7 @@
 void get_globalStateList(SStateList *output);
 void set_globalState_Menu_Page(uint8_t page);
 void set_globalState_Menu_Line(uint8_t line);
+uint8_t get_globalState_Menu_Line(void);
 void get_idSpecificStateList(uint32_t id, SStateList *output);
 void delayMicros(uint32_t micros);
 void get_RTC_DateTime(RTC_DateTypeDef * sdatestructureget, RTC_TimeTypeDef * stimestructureget);
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Inc/crcmodel.h
--- a/Discovery/Inc/crcmodel.h	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Inc/crcmodel.h	Mon May 22 09:15:09 2023 +0200
@@ -112,8 +112,9 @@
 
 #ifndef DONE_STYLE
 
+#include <stdbool.h>
+
 typedef unsigned long   ulong;
-typedef unsigned        bool;
 typedef unsigned char * p_ubyte_;
 
 #ifndef TRUE
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Inc/tMenuEdit.h
--- a/Discovery/Inc/tMenuEdit.h	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Inc/tMenuEdit.h	Mon May 22 09:15:09 2023 +0200
@@ -50,6 +50,11 @@
 #define UPDATE_AND_EXIT_TO_MENU 	(255)
 #define UNSPECIFIC_RETURN			(254)
 
+typedef union {
+    uint32_t uint32;
+    int32_t int32;
+} input_u;
+
 void sendActionToMenuEdit(uint8_t sendAction);
 
 void tMenuEdit_init(void);
@@ -75,7 +80,7 @@
 void write_field_2digit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint32_t int1,  uint32_t int2,  uint32_t int3,  uint32_t int4);
 void write_field_3digit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint32_t int1,  uint32_t int2,  uint32_t int3,  uint32_t int4);
 void write_field_select(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint8_t int1,  uint8_t int2,  uint8_t int3,  uint8_t int4);
-/*void write_field_sdigit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, int32_t int1,  int32_t int2,  int32_t int3,  int32_t int4);*/
+void write_field_sdigit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, int32_t int1, int32_t int2, int32_t int3, int32_t int4);
 void write_field_button(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text);
 void write_field_symbol(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint8_t int1);
 void write_field_toggle(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint8_t int1,  uint8_t int2);
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Inc/tStructure.h
--- a/Discovery/Inc/tStructure.h	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Inc/tStructure.h	Mon May 22 09:15:09 2023 +0200
@@ -266,6 +266,7 @@
 #define StMHARD2_Compass_ResetCourse	_MB(2,7,2,3,0)
 #define StMHARD2_Compass_Calibrate		_MB(2,7,2,4,0)
 #define StMHARD2_Compass_Inertia		_MB(2,7,2,5,0)
+#define StMHARD2_Compass_Declination	_MB(2,7,2,6,0)
 
 //#define StMHARD2_Exit						_MB(2,7,2,2,0)
 
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Inc/text_multilanguage.h
--- a/Discovery/Inc/text_multilanguage.h	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Inc/text_multilanguage.h	Mon May 22 09:15:09 2023 +0200
@@ -211,6 +211,7 @@
 		TXT2BYTE_SpecialDiveGasMenuCCR,
 		TXT2BYTE_CompassCalib,
 		TXT2BYTE_CompassInertia,
+		TXT2BYTE_CompassDeclination,
 		TXT2BYTE_UseSensor,
 		TXT2BYTE_AutomaticSP,
 		/* */
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/base.c
--- a/Discovery/Src/base.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/base.c	Mon May 22 09:15:09 2023 +0200
@@ -1051,6 +1051,12 @@
 }
 
 
+uint8_t get_globalState_Menu_Line(void)
+{
+    return (globalStateID & ~MaskLineFieldDigit) >> 16;
+}
+
+
 void set_globalState(uint32_t newID)
 {
     globalStateID = newID;
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/data_central.c
--- a/Discovery/Src/data_central.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/data_central.c	Mon May 22 09:15:09 2023 +0200
@@ -861,6 +861,13 @@
 	return retVal;
 }
 
+
+bool isCompassCalibrated(void)
+{
+    return stateUsed->lifeData.compass_heading != -1;
+}
+
+
 void setCompassHeading(uint16_t heading)
 {
 
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/data_exchange_main.c
--- a/Discovery/Src/data_exchange_main.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/data_exchange_main.c	Mon May 22 09:15:09 2023 +0200
@@ -1096,11 +1096,19 @@
 		pStateReal->lifeData.surface_time_seconds = (int32_t)dataIn.data[dataIn.boolTimeData].surfacetime_seconds;
 
 		pStateReal->lifeData.compass_heading = dataIn.data[dataIn.boolCompassData].compass_heading;
-		if(settingsGetPointer()->FlipDisplay) /* consider that diver is targeting into the opposite direction */
-		{
-			pStateReal->lifeData.compass_heading -= 180.0;
-			if (pStateReal->lifeData.compass_heading < 0) pStateReal->lifeData.compass_heading +=360.0;
-		}
+        if (pStateReal->lifeData.compass_heading != -1) {
+            if (pSettings->FlipDisplay) { /* consider that diver is targeting into the opposite direction */
+                pStateReal->lifeData.compass_heading -= 180.0;
+            }
+
+            if (pSettings->compassDeclinationDeg != 0) {
+                pStateReal->lifeData.compass_heading = pStateReal->lifeData.compass_heading + pSettings->compassDeclinationDeg - 360.0;
+            }
+
+            while (pStateReal->lifeData.compass_heading < 0) {
+                pStateReal->lifeData.compass_heading += 360.0;
+            }
+        }
 
 		pStateReal->lifeData.compass_roll = dataIn.data[dataIn.boolCompassData].compass_roll;
 		pStateReal->lifeData.compass_pitch = dataIn.data[dataIn.boolCompassData].compass_pitch;
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/settings.c
--- a/Discovery/Src/settings.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/settings.c	Mon May 22 09:15:09 2023 +0200
@@ -89,7 +89,7 @@
  * There might even be entries with fixed values that have no range
  */
 const SSettings SettingsStandard = {
-    .header = 0xFFFF0025,
+    .header = 0xFFFF0026,
     .warning_blink_dsec = 8 * 2,
     .lastDiveLogId = 0,
     .logFlashNextSampleStartAddress = SAMPLESTART,
@@ -332,7 +332,8 @@
 	.ext_sensor_map[2] = SENSOR_OPTIC,
 	.ext_sensor_map[3] = SENSOR_NONE,
 	.ext_sensor_map[4] = SENSOR_NONE,
-	.buttonLockActive = 0
+	.buttonLockActive = 0,
+    .compassDeclinationDeg = 0,
 };
 
 /* Private function prototypes -----------------------------------------------*/
@@ -534,6 +535,10 @@
     	// no break;
     case 0xFFFF0024: pSettings->buttonLockActive = 0;
     	// no break;
+    case 0xFFFF0025:
+        pSettings->compassDeclinationDeg = pStandard->compassDeclinationDeg;
+
+    	// no break;
     default:
         pSettings->header = pStandard->header;
         break; // no break before!!
@@ -1578,6 +1583,16 @@
         corrections++;
     }
 
+    if (Settings.compassDeclinationDeg > 99) {
+        Settings.compassDeclinationDeg = 99;
+
+        corrections++;
+    } else if (Settings.compassDeclinationDeg < -99) {
+        Settings.compassDeclinationDeg = -99;
+
+        corrections++;
+    }
+
     if(corrections)
     {
     	settingsWarning = 1;
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/t7.c
--- a/Discovery/Src/t7.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/t7.c	Mon May 22 09:15:09 2023 +0200
@@ -1762,12 +1762,6 @@
 }
 
 
-bool isCompassCalibrated(void)
-{
-    return stateUsed->lifeData.compass_heading != -1;
-}
-
-
 static void t7_CcrSummary(SSettings *settings)
 {
     unsigned numLines = 1; // CCR Mode
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/tMenuEdit.c
--- a/Discovery/Src/tMenuEdit.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/tMenuEdit.c	Mon May 22 09:15:09 2023 +0200
@@ -27,6 +27,8 @@
 //////////////////////////////////////////////////////////////////////////////
 
 /* Includes ------------------------------------------------------------------*/
+#include <stdlib.h>
+
 #include "tMenuEdit.h"
 
 #include "externLogbookFlash.h"
@@ -60,7 +62,7 @@
 {
     char orgText[32];
     char newText[32];
-    uint16_t input[4];
+    uint32_t input[4];
     uint16_t coord[3];
     int8_t begin[4], size[4];
     tFont *fontUsed;
@@ -80,6 +82,7 @@
     FIELD_UDIGIT,
     FIELD_2DIGIT,
     FIELD_3DIGIT,
+    FIELD_SDIGIT,
     FIELD_FLOAT,
     FIELD_END
 } SField;
@@ -616,15 +619,15 @@
     case FIELD_NUMBERS:
         write_buttonTextline(TXT2BYTE_ButtonMinus,TXT2BYTE_ButtonEnter,TXT2BYTE_ButtonPlus);
 
-        if(ident[id].subtype == FIELD_UDIGIT)
-        {
+        switch (ident[id].subtype) {
+        case FIELD_UDIGIT:
             if((newContent >= '0') && (newContent <= '9'))
                 ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
 
             mark_new_digit_of_actual_id_block_and_subBlock();
-        }
-        else if(ident[id].subtype == FIELD_3DIGIT)
-        {
+
+            break;
+        case FIELD_3DIGIT:
             if((newContent >= '0') && (newContent <= '0'+200))
             {
                 split_Content_to_Digit_helper( newContent, &digit100, &digit10, &digit1);
@@ -633,15 +636,25 @@
                 ident[id].newText[ident[id].begin[block] + 2] = '0' + digit1;
                 mark_new_3digit_of_actual_id_block();
             }
-        }
-        else // FIELD_2DIGIT
-        {
+
+            break;
+        case FIELD_2DIGIT:
             if((newContent >= '0') && (newContent <= '0'+99))
             {
                 ident[id].newText[ident[id].begin[block]] = '0' + (newContent - '0')/10;
                 ident[id].newText[ident[id].begin[block] + 1] = '0' + ((newContent - '0') - (10*((newContent - '0')/10)));
                 mark_new_2digit_of_actual_id_block();
             }
+
+            break;
+        case FIELD_SDIGIT:
+            if ((subBlockPosition == 0 && (newContent == '+' || newContent == '-')) || (subBlockPosition > 0 && newContent >= '0' && newContent <= '9')) {
+                ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
+            }
+
+            mark_new_digit_of_actual_id_block_and_subBlock();
+
+            break;
         }
         break;
     case FIELD_BUTTON:
@@ -758,6 +771,10 @@
     {
         ident[id].newText[ident[id].begin[block] + 0] = '0' + (newContent - '0')/10;
         ident[id].newText[ident[id].begin[block] + 1] = '0' + ((newContent - '0') - (10*((newContent - '0')/10)));
+    } else if (ident[id].maintype == FIELD_NUMBERS && ident[id].subtype == FIELD_SDIGIT && action == ACTION_BUTTON_ENTER && subBlockPosition == 0) {
+        if (newContent == '+' || newContent == '-') {
+            ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
+        }
     }
     else
     if((ident[id].maintype == FIELD_NUMBERS) && (action == ACTION_BUTTON_ENTER) && (newContent >= '0') && (newContent <= '9'))
@@ -813,6 +830,15 @@
     return CopyContent;
 }
 
+
+static void checkUpdateSDigit(uint8_t newContent)
+{
+    if ((subBlockPosition == 0 && (newContent == '+' || newContent == '-')) || (subBlockPosition > 0 && newContent >= '0' && newContent <= '9')) {
+        ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
+    }
+}
+
+
 void upMenuEditFieldDigit(void)
 {
     uint8_t newContent;
@@ -843,8 +869,11 @@
         return;
     }
 
-    if((ident[id].maintype == FIELD_NUMBERS) && (newContent >= '0') && (newContent <= '9'))
+    if (ident[id].maintype == FIELD_NUMBERS && ident[id].subtype == FIELD_SDIGIT) {
+        checkUpdateSDigit(newContent);
+    } else if (ident[id].maintype == FIELD_NUMBERS && newContent >= '0' && newContent <= '9') {
         ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
+    }
 
     mark_new_digit_of_actual_id_block_and_subBlock();
 }
@@ -880,8 +909,11 @@
         return;
     }
 
-    if((ident[id].maintype == FIELD_NUMBERS) && (newContent >= '0') && (newContent <= '9'))
+    if (ident[id].maintype == FIELD_NUMBERS && ident[id].subtype == FIELD_SDIGIT) {
+        checkUpdateSDigit(newContent);
+    } else if (ident[id].maintype == FIELD_NUMBERS && newContent >= '0' && newContent <= '9') {
         ident[id].newText[ident[id].begin[block] + subBlockPosition] = newContent;
+    }
 
     mark_new_digit_of_actual_id_block_and_subBlock();
 }
@@ -892,6 +924,8 @@
     if(editID != ident[id].callerID)
         return;
 
+    bool isSigned = ident[id].maintype == FIELD_NUMBERS && ident[id].subtype == FIELD_SDIGIT;
+
     uint8_t i, digitCount, digit;
     uint32_t sum[4], multiplier;
 
@@ -905,25 +939,41 @@
         for(digitCount = 1; digitCount < ident[id].size[i]; digitCount++)
             multiplier *= 10;
 
+        bool isNegative = false;
         for(digitCount = 0; digitCount < ident[id].size[i]; digitCount++)
         {
             digit = ident[id].newText[ident[id].begin[i] + digitCount];
 
-            if(digit > '0')
-                digit -= '0';
-            else
-                digit = 0;
+            if (isSigned && digitCount == 0) {
+                if (digit == '-') {
+                    isNegative = true;
+                }
+            } else {
+                if(digit > '0')
+                    digit -= '0';
+                else
+                    digit = 0;
 
-            if(digit > 9)
-                digit = 9;
+                if(digit > 9)
+                    digit = 9;
 
-            sum[i] += digit * multiplier;
+                sum[i] += digit * multiplier;
+            }
 
             if(multiplier >= 10)
                 multiplier /= 10;
             else
                 multiplier = 0;
         }
+
+        if (isSigned) {
+            int32_t value = sum[i];
+            if (isNegative) {
+                value = -value;
+            }
+            sum[i] = ((input_u)value).uint32;
+        }
+
         i++;
     }
 
@@ -1180,13 +1230,24 @@
         return;
     }
 
+    bool isSigned = ident[id].maintype == FIELD_NUMBERS && ident[id].subtype == FIELD_SDIGIT;
+
     uint8_t i, digitCount;
     uint32_t remainder, digit, divider;
 
     i = 0;
     while( ident[id].size[i] && (i < 4))
     {
-        remainder = ident[id].input[i];
+        bool isNegative = false;
+        if (isSigned) {
+            int32_t value = ((input_u)ident[id].input[i]).int32;
+            if (value < 0) {
+                isNegative = true;
+            }
+            remainder = abs(value);
+        } else {
+            remainder = ident[id].input[i];
+        }
         divider = 1;
 
         for(digitCount = 1; digitCount < ident[id].size[i]; digitCount++)
@@ -1194,13 +1255,18 @@
 
         for(digitCount = 0; digitCount < ident[id].size[i]; digitCount++)
         {
-            digit = remainder	/ divider;
-            remainder -= digit * divider;
+            if (isSigned && digitCount == 0) {
+                ident[id].newText[ident[id].begin[i] + digitCount] = isNegative ? '-' : '+';
+            } else {
+                digit = remainder	/ divider;
+                remainder -= digit * divider;
+                if(digit < 10)
+                    ident[id].newText[ident[id].begin[i] + digitCount] = digit + '0';
+                else
+                    ident[id].newText[ident[id].begin[i] + digitCount] = 'x';
+            }
+
             divider /= 10;
-            if(digit < 10)
-                ident[id].newText[ident[id].begin[i] + digitCount] = digit + '0';
-            else
-                ident[id].newText[ident[id].begin[i] + digitCount] = 'x';
         }
         i++;
     }
@@ -1310,11 +1376,12 @@
     write_field_udigit_and_2digit(FIELD_3DIGIT, editID,XleftGimpStyle,XrightGimpStyle,YtopGimpStyle,Font,text,int1,int2,int3,int4);
 }
 
-/*
-void write_field_sdigit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, int32_t int1,  int32_t int2,  int32_t int3,  int32_t int4)
+
+void write_field_sdigit(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, int32_t int1, int32_t int2, int32_t int3, int32_t int4)
 {
+    write_field_udigit_and_2digit(FIELD_SDIGIT, editID, XleftGimpStyle, XrightGimpStyle, YtopGimpStyle, Font, text, ((input_u)int1).uint32, ((input_u)int2).uint32, ((input_u)int3).uint32, ((input_u)int4).uint32);
 }
-*/
+
 
 void write_field_select(uint32_t editID, uint16_t XleftGimpStyle, uint16_t XrightGimpStyle, uint16_t YtopGimpStyle, const tFont *Font, const char *text, uint8_t int1,  uint8_t int2,  uint8_t int3,  uint8_t int4)
 {
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/tMenuEditHardware.c
--- a/Discovery/Src/tMenuEditHardware.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/tMenuEditHardware.c	Mon May 22 09:15:09 2023 +0200
@@ -159,8 +159,87 @@
     exitMenuEdit_to_Home();
 }
 
+
+static uint8_t togglePlusMinus(uint8_t input)
+{
+    if (input == '+') {
+        return '-';
+    } else {
+        return '+';
+    }
+}
+
+
+static uint8_t OnAction_CompassDeclination(uint32_t editId, uint8_t blockNumber, uint8_t digitNumber, uint8_t digitContent, uint8_t action)
+{
+    SSettings *settings = settingsGetPointer();
+    uint8_t digitContentNew;
+    switch (action) {
+    case ACTION_BUTTON_ENTER:
+
+        return digitContent;
+    case ACTION_BUTTON_ENTER_FINAL:
+        {
+            int32_t compassDeclinationDeg;
+            evaluateNewString(editId, (uint32_t *)&compassDeclinationDeg, NULL, NULL, NULL);
+
+            if (compassDeclinationDeg > 99) {
+                compassDeclinationDeg = 99;
+            } else if (compassDeclinationDeg < -99) {
+                compassDeclinationDeg = -99;
+            }
+
+            settings->compassDeclinationDeg = compassDeclinationDeg;
+
+            tMenuEdit_newInput(editId, ((input_u)compassDeclinationDeg).uint32, 0, 0, 0);
+        }
+
+        break;
+    case ACTION_BUTTON_NEXT:
+        if (digitNumber == 0) {
+            digitContentNew = togglePlusMinus(digitContent);
+        } else {
+            digitContentNew = digitContent + 1;
+            if (digitContentNew > '9') {
+                digitContentNew = '0';
+            }
+        }
+
+        return digitContentNew;
+    case ACTION_BUTTON_BACK:
+        if (digitNumber == 0) {
+            digitContentNew = togglePlusMinus(digitContent);
+        } else {
+            digitContentNew = digitContent - 1;
+            if (digitContentNew < '0') {
+                digitContentNew = '9';
+            }
+        }
+
+        return digitContentNew;
+    }
+
+    return UNSPECIFIC_RETURN;
+}
+
+
+static void showCompassDeclination(SSettings *settings, bool isRefresh)
+{
+    char text[16];
+    snprintf(text, 16, "%c%c:", TXT_2BYTE, TXT2BYTE_CompassDeclination);
+    write_label_var(30, 800, ME_Y_LINE6, &FontT48, text);
+    if (isRefresh) {
+        tMenuEdit_refresh_field(StMHARD2_Compass_Declination);
+    } else {
+        write_field_sdigit(StMHARD2_Compass_Declination, 500, 800, ME_Y_LINE6, &FontT48, "\034###`", settings->compassDeclinationDeg, 0, 0, 0);
+    }
+}
+
+
 void refresh_CompassEdit(void)
 {
+    SSettings *settings = settingsGetPointer();
+
     uint16_t heading;
     char text[32];
     uint8_t textIndex = 0;
@@ -171,7 +250,7 @@
     text[3] = 0;
     write_topline(text);
 
-    if(settingsGetPointer()->compassInertia)
+    if(settings->compassInertia)
     {
     	heading = (uint16_t)compass_getCompensated();
     }
@@ -189,16 +268,20 @@
     text[textIndex++] = TXT2BYTE_CompassInertia;
     text[textIndex++] = ':';
     text[textIndex++] = ' ';
-    text[textIndex++] = '0' + settingsGetPointer()->compassInertia;
+    text[textIndex++] = '0' + settings->compassInertia;
 
     write_label_var(30, 800, ME_Y_LINE5,  &FontT48, text);
 
+    showCompassDeclination(settings, true);
+
     write_buttonTextline(TXT2BYTE_ButtonBack,TXT2BYTE_ButtonEnter,TXT2BYTE_ButtonNext);
 }
 
 
 void openEdit_Compass(void)
 {
+    SSettings *settings = settingsGetPointer();
+
     char text[10];
     uint8_t textIndex = 0;
 
@@ -214,24 +297,28 @@
     text[1] = TXT2BYTE_SetBearing;
     write_field_button(StMHARD2_Compass_SetCourse,	 30, 800, ME_Y_LINE2,  &FontT48, text);
 
-    text[1] = TXT2BYTE_CompassCalib;
-    write_field_button(StMHARD2_Compass_Calibrate,	 30, 800, ME_Y_LINE3,  &FontT48, text);
+    text[1] = TXT2BYTE_ResetBearing;
+    write_field_button(StMHARD2_Compass_ResetCourse, 30, 800, ME_Y_LINE3,  &FontT48, text);
 
-    text[1] = TXT2BYTE_ResetBearing;
-    write_field_button(StMHARD2_Compass_ResetCourse, 30, 800, ME_Y_LINE4,  &FontT48, text);
+    text[1] = TXT2BYTE_CompassCalib;
+    write_field_button(StMHARD2_Compass_Calibrate,	 30, 800, ME_Y_LINE4,  &FontT48, text);
 
     text[1] = TXT2BYTE_CompassInertia;
     textIndex = 2;
     text[textIndex++] = ':';
     text[textIndex++] = ' ';
-    text[textIndex++] = '0' + settingsGetPointer()->compassInertia;
+    text[textIndex++] = '0' + settings->compassInertia;
+    text[textIndex++] = 0;
 
     write_field_button(StMHARD2_Compass_Inertia, 30, 800, ME_Y_LINE5,  &FontT48, text);
 
+    showCompassDeclination(settings, false);
+
     setEvent(StMHARD2_Compass_SetCourse,		(uint32_t)OnAction_Bearing);
+    setEvent(StMHARD2_Compass_ResetCourse,	(uint32_t)OnAction_BearingClear);
     setEvent(StMHARD2_Compass_Calibrate,		(uint32_t)OnAction_Compass);
-    setEvent(StMHARD2_Compass_ResetCourse,	(uint32_t)OnAction_BearingClear);
     setEvent(StMHARD2_Compass_Inertia,	(uint32_t)OnAction_InertiaLevel);
+    setEvent(StMHARD2_Compass_Declination, (uint32_t)OnAction_CompassDeclination);
 
     write_buttonTextline(TXT2BYTE_ButtonBack,TXT2BYTE_ButtonEnter,TXT2BYTE_ButtonNext);
 }
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/tMenuEditXtra.c
--- a/Discovery/Src/tMenuEditXtra.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/tMenuEditXtra.c	Mon May 22 09:15:09 2023 +0200
@@ -377,17 +377,24 @@
 }
 
 
-static void drawCompassHeadingMenu(bool doInitialise)
+static void drawCompassHeadingMenu(bool isRefresh)
 {
+    SSettings *settings = settingsGetPointer();
+
     char text[32];
     snprintf(text, 32, "\001%c%c", TXT_2BYTE, TXT2BYTE_CompassHeading);
     write_topline(text);
 
-    uint16_t heading = (uint16_t)stateUsed->lifeData.compass_heading;
+    uint16_t heading;
+    if (settings->compassInertia) {
+        heading = (uint16_t)compass_getCompensated();
+    } else {
+        heading = (uint16_t)stateUsed->lifeData.compass_heading;
+    }
     snprintf(text,32,"\001%03i`",heading);
     write_label_var(0, 800, ME_Y_LINE1, &FontT54, text);
 
-    if (doInitialise) {
+    if (!isRefresh) {
         snprintf(text, 32, "%c%c", TXT_2BYTE, TXT2BYTE_Set);
         write_field_button(StMXTRA_CompassHeading, 20, 800, ME_Y_LINE2, &FontT48, text);
     } else {
@@ -397,7 +404,7 @@
     bool headingIsSet = stateUsed->diveSettings.compassHeading;
     snprintf(text, 32, "%s%c%c", makeGrey(!headingIsSet), TXT_2BYTE, TXT2BYTE_Clear);
     if (headingIsSet) {
-        if (doInitialise) {
+        if (!isRefresh) {
             write_field_button(StMXTRA_CompassHeadingClear, 20, 800, ME_Y_LINE3, &FontT48, text);
         } else {
             tMenuEdit_refresh_field(StMXTRA_CompassHeadingClear);
@@ -406,11 +413,11 @@
         write_label_var(20, 800, ME_Y_LINE3, &FontT48, text);
     }
 
-    int16_t compassBearing = settingsGetPointer()->compassBearing;
+    int16_t compassBearing = settings->compassBearing;
     bool canSetBearing = compassBearing && compassBearing != stateUsed->diveSettings.compassHeading;
     snprintf(text, 32, "%s%c%c (%03u`)", makeGrey(!canSetBearing), TXT_2BYTE, TXT2BYTE_Reset, compassBearing);
     if (canSetBearing) {
-        if (doInitialise) {
+        if (!isRefresh) {
             write_field_button(StMXTRA_CompassHeadingReset, 20, 800, ME_Y_LINE4, &FontT48, text);
         } else {
             tMenuEdit_refresh_field(StMXTRA_CompassHeadingReset);
@@ -419,7 +426,7 @@
         write_label_var(20, 800, ME_Y_LINE4, &FontT48, text);
     }
 
-    if (doInitialise) {
+    if (!isRefresh) {
         setEvent(StMXTRA_CompassHeading, (uint32_t)OnAction_CompassHeading);
         setEvent(StMXTRA_CompassHeadingClear, (uint32_t)OnAction_CompassHeadingClear);
         setEvent(StMXTRA_CompassHeadingReset, (uint32_t)OnAction_CompassHeadingReset);
@@ -431,7 +438,7 @@
 
 void refresh_CompassHeading(void)
 {
-    drawCompassHeadingMenu(false);
+    drawCompassHeadingMenu(true);
 }
 
 
@@ -454,7 +461,7 @@
 
 void openEdit_CompassHeading(void)
 {
-    drawCompassHeadingMenu(true);
+    drawCompassHeadingMenu(false);
 }
 
 
diff -r 6a8cf91e5b22 -r 74253a41cf80 Discovery/Src/text_multilanguage.c
--- a/Discovery/Src/text_multilanguage.c	Mon May 22 09:14:27 2023 +0200
+++ b/Discovery/Src/text_multilanguage.c	Mon May 22 09:15:09 2023 +0200
@@ -182,6 +182,12 @@
 static uint8_t text_IT_CompassInertia[] = "";
 static uint8_t text_ES_CompassInertia[] = "";
 
+static uint8_t text_EN_CompassDeclination[] = "Compass declination";
+static uint8_t text_DE_CompassDeclination[] = "Kompass Deklination";
+static uint8_t text_FR_CompassDeclination[] = "Déclinaison";
+static uint8_t text_IT_CompassDeclination[] = "Ddeclinazione";
+static uint8_t text_ES_CompassDeclination[] = "Declinación";
+
 
 // Menu SYS1 and Customview header
 static uint8_t text_EN_Compass[] = "Compass";
@@ -1982,6 +1988,7 @@
     {(uint8_t)TXT2BYTE_SpecialDiveGasMenuCCR,{text_EN_SpecialDiveGasMenuCCR, text_DE_SpecialDiveGasMenuCCR, text_FR_SpecialDiveGasMenuCCR, text_IT_SpecialDiveGasMenuCCR, text_ES_SpecialDiveGasMenuCCR}},
     {(uint8_t)TXT2BYTE_CompassCalib, 	{text_EN_CompassCalib, text_DE_CompassCalib, text_FR_CompassCalib, text_IT_CompassCalib, text_ES_CompassCalib}},
 	{(uint8_t)TXT2BYTE_CompassInertia,	{text_EN_CompassInertia, text_DE_CompassInertia, text_FR_CompassInertia, text_IT_CompassInertia, text_ES_CompassInertia}},
+	{(uint8_t)TXT2BYTE_CompassDeclination,	{text_EN_CompassDeclination, text_DE_CompassDeclination, text_FR_CompassDeclination, text_IT_CompassDeclination, text_ES_CompassDeclination}},
 	{(uint8_t)TXT2BYTE_UseSensor,		{text_EN_UseSensor, text_DE_UseSensor, text_FR_UseSensor, text_IT_UseSensor, text_ES_UseSensor}},
 	{(uint8_t)TXT2BYTE_AutomaticSP,		{text_EN_AutomaticSP, text_DE_AutomaticSP, text_FR_AutomaticSP, text_IT_AutomaticSP, text_ES_AutomaticSP}},
     {(uint8_t)TXT2BYTE_WarnDecoMissed,  {text_EN_WarnDecoMissed, text_DE_WarnDecoMissed, text_FR_WarnDecoMissed, text_IT_WarnDecoMissed, text_ES_WarnDecoMissed}},