diff --git a/include/field_overworld_state.h b/include/field_overworld_state.h
index c9844d0d23..94375578f6 100644
--- a/include/field_overworld_state.h
+++ b/include/field_overworld_state.h
@@ -3,12 +3,12 @@
 
 #include "struct_decls/struct_0203A790_decl.h"
 #include "struct_decls/struct_0203A79C_decl.h"
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/struct_0205EC34.h"
 
 #include "field/field_system_decl.h"
 
 #include "location.h"
+#include "overworld_map_history.h"
 #include "savedata.h"
 
 int FieldOverworldState_Size(void);
@@ -26,7 +26,7 @@ u16 FieldOverworldState_GetWeather(const FieldOverworldState *fieldState);
 void FieldOverworldState_SetWeather(FieldOverworldState *fieldState, u16 weather);
 u16 FieldOverworldState_GetWarpId(const FieldOverworldState *fieldState);
 void FieldOverworldState_SetWarpId(FieldOverworldState *fieldState, u16 warpId);
-UnkStruct_020556C4 *sub_0203A76C(FieldOverworldState *fieldState);
+OverworldMapHistory *FieldOverworldState_GetMapHistory(FieldOverworldState *fieldState);
 int FieldOverworldState_GetCameraType(const FieldOverworldState *fieldState);
 void FieldOverworldState_SetCameraType(FieldOverworldState *fieldState, int type);
 PlayerData *FieldOverworldState_GetPlayerData(FieldOverworldState *fieldState);
diff --git a/include/overworld_map_history.h b/include/overworld_map_history.h
new file mode 100644
index 0000000000..cd1c734cdf
--- /dev/null
+++ b/include/overworld_map_history.h
@@ -0,0 +1,22 @@
+#ifndef POKEPLATINUM_OVERWORLD_MAP_HISTORY_H
+#define POKEPLATINUM_OVERWORLD_MAP_HISTORY_H
+
+typedef struct OverworldMapHistoryItem {
+    u8 mapX;
+    u8 mapZ;
+    u8 faceDirection;
+    u8 dummy_03; // this is always set to 1
+} OverworldMapHistoryItem;
+
+typedef struct OverworldMapHistory {
+    int historyPointer;
+    u8 currentMapX;
+    u8 currentMapZ;
+    OverworldMapHistoryItem items[6];
+} OverworldMapHistory;
+
+void OverworldMapHistory_Clear(OverworldMapHistory *mapHistory);
+void OverworldMapHistory_PushViaWarp(OverworldMapHistory *mapHistory, int x, int z);
+void OverworldMapHistory_Push(OverworldMapHistory *mapHistory, int x, int z, int faceDirection);
+
+#endif // POKEPLATINUM_OVERWORLD_MAP_HISTORY_H
diff --git a/include/struct_defs/struct_020556C4.h b/include/struct_defs/struct_020556C4.h
deleted file mode 100644
index 2323d801ea..0000000000
--- a/include/struct_defs/struct_020556C4.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef POKEPLATINUM_STRUCT_020556C4_H
-#define POKEPLATINUM_STRUCT_020556C4_H
-
-#include "struct_defs/struct_020556C4_sub1.h"
-
-typedef struct {
-    int unk_00;
-    u8 unk_04;
-    u8 unk_05;
-    UnkStruct_020556C4_sub1 unk_06[6];
-} UnkStruct_020556C4;
-
-#endif // POKEPLATINUM_STRUCT_020556C4_H
diff --git a/include/struct_defs/struct_020556C4_sub1.h b/include/struct_defs/struct_020556C4_sub1.h
deleted file mode 100644
index 640092d773..0000000000
--- a/include/struct_defs/struct_020556C4_sub1.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef POKEPLATINUM_STRUCT_020556C4_SUB1_H
-#define POKEPLATINUM_STRUCT_020556C4_SUB1_H
-
-typedef struct {
-    u8 unk_00;
-    u8 unk_01;
-    u8 unk_02;
-    u8 unk_03;
-} UnkStruct_020556C4_sub1;
-
-#endif // POKEPLATINUM_STRUCT_020556C4_SUB1_H
diff --git a/include/struct_defs/struct_0205EC34.h b/include/struct_defs/struct_0205EC34.h
index 2656601b16..00c8bb2c0c 100644
--- a/include/struct_defs/struct_0205EC34.h
+++ b/include/struct_defs/struct_0205EC34.h
@@ -2,7 +2,7 @@
 #define POKEPLATINUM_STRUCT_0205EC34_H
 
 typedef struct {
-    u16 unk_00;
+    u16 cyclingGear;
     u16 runningShoes;
     u32 form;
 } PlayerData;
diff --git a/include/unk_020556C4.h b/include/unk_020556C4.h
deleted file mode 100644
index 59dea1e387..0000000000
--- a/include/unk_020556C4.h
+++ /dev/null
@@ -1,10 +0,0 @@
-#ifndef POKEPLATINUM_UNK_020556C4_H
-#define POKEPLATINUM_UNK_020556C4_H
-
-#include "struct_defs/struct_020556C4.h"
-
-void sub_020556C4(UnkStruct_020556C4 *param0);
-void sub_020556E8(UnkStruct_020556C4 *param0, int param1, int param2);
-void sub_02055740(UnkStruct_020556C4 *param0, int param1, int param2, int param3);
-
-#endif // POKEPLATINUM_UNK_020556C4_H
diff --git a/platinum.us/main.lsf b/platinum.us/main.lsf
index 566b562fe7..c2c295333f 100644
--- a/platinum.us/main.lsf
+++ b/platinum.us/main.lsf
@@ -230,7 +230,7 @@ Static main
 	Object main.nef.p/src_terrain_attributes.c.o
 	Object main.nef.p/src_terrain_collision_manager.c.o
 	Object main.nef.p/src_unk_020553DC.c.o
-	Object main.nef.p/src_unk_020556C4.c.o
+	Object main.nef.p/src_overworld_map_history.c.o
 	Object main.nef.p/src_field_transition.c.o
 	Object main.nef.p/src_unk_020559DC.c.o
 	Object main.nef.p/src_unk_02055C50.c.o
diff --git a/src/field_overworld_state.c b/src/field_overworld_state.c
index be90b52299..f7e23c9e5f 100644
--- a/src/field_overworld_state.c
+++ b/src/field_overworld_state.c
@@ -3,17 +3,16 @@
 #include <nitro.h>
 #include <string.h>
 
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/struct_0205EC34.h"
 
 #include "field/field_system.h"
 
 #include "location.h"
 #include "map_object.h"
+#include "overworld_map_history.h"
 #include "player_avatar.h"
 #include "savedata.h"
 #include "unk_0203A7D8.h"
-#include "unk_020556C4.h"
 
 typedef struct FieldOverworldState {
     Location player;
@@ -25,13 +24,12 @@ typedef struct FieldOverworldState {
     u16 weather;
     u16 warpId;
     u8 cameraType;
-    UnkStruct_020556C4 unk_6C;
+    OverworldMapHistory mapHistory;
     PlayerData playerData;
     u16 poisonSteps;
     u16 safariSteps;
     u16 safariBalls;
-    u16 padding_9A; // unused
-    u16 padding_9C; // unused
+    u8 padding_9A[6];
 } FieldOverworldState;
 
 typedef struct UnkStruct_0203A79C_t {
@@ -57,7 +55,7 @@ void FieldOverworldState_Init(FieldOverworldState *fieldState)
 {
     memset(fieldState, 0, sizeof(FieldOverworldState));
 
-    sub_020556C4(&fieldState->unk_6C);
+    OverworldMapHistory_Clear(&fieldState->mapHistory);
     PlayerData_Init(&fieldState->playerData);
 
     fieldState->warpId = sub_0203A7EC();
@@ -119,9 +117,9 @@ void FieldOverworldState_SetWarpId(FieldOverworldState *fieldState, u16 warpId)
     fieldState->warpId = warpId;
 }
 
-UnkStruct_020556C4 *sub_0203A76C(FieldOverworldState *fieldState)
+OverworldMapHistory *FieldOverworldState_GetMapHistory(FieldOverworldState *fieldState)
 {
-    return &fieldState->unk_6C;
+    return &fieldState->mapHistory;
 }
 
 int FieldOverworldState_GetCameraType(const FieldOverworldState *fieldState)
diff --git a/src/meson.build b/src/meson.build
index c475b5f969..d054f0d9e8 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -217,7 +217,7 @@ pokeplatinum_c = files(
     'terrain_attributes.c',
     'terrain_collision_manager.c',
     'unk_020553DC.c',
-    'unk_020556C4.c',
+    'overworld_map_history.c',
     'field_transition.c',
     'unk_020559DC.c',
     'unk_02055C50.c',
diff --git a/src/overlay005/fieldmap.c b/src/overlay005/fieldmap.c
index 5f2482521f..81bd6ea01f 100644
--- a/src/overlay005/fieldmap.c
+++ b/src/overlay005/fieldmap.c
@@ -10,7 +10,6 @@
 
 #include "struct_decls/struct_02020C44_decl.h"
 #include "struct_decls/struct_0203A790_decl.h"
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/struct_02099F80.h"
 
 #include "field/field_system.h"
@@ -70,6 +69,7 @@
 #include "map_object.h"
 #include "narc.h"
 #include "overlay_manager.h"
+#include "overworld_map_history.h"
 #include "persisted_map_features.h"
 #include "player_avatar.h"
 #include "pltt_transfer.h"
@@ -82,7 +82,6 @@
 #include "unk_02020AEC.h"
 #include "unk_0202419C.h"
 #include "unk_020553DC.h"
-#include "unk_020556C4.h"
 #include "unk_020559DC.h"
 #include "unk_02055C50.h"
 #include "vram_transfer.h"
@@ -512,19 +511,16 @@ static void ov5_021D134C(FieldSystem *fieldSystem, u8 param1)
 
 static void ov5_021D13B4(FieldSystem *fieldSystem)
 {
-    UnkStruct_020556C4 *v0;
-    int v1, v2, v3;
-
     if (MapHeader_IsOnMainMatrix(fieldSystem->location->mapId) == 0) {
         return;
     }
 
-    v0 = sub_0203A76C(SaveData_GetFieldOverworldState(fieldSystem->saveData));
-    v1 = (Player_GetXPos(fieldSystem->playerAvatar) - LandDataManager_GetOffsetTileX(fieldSystem->landDataMan)) / MAP_TILES_COUNT_X;
-    v2 = (Player_GetZPos(fieldSystem->playerAvatar) - LandDataManager_GetOffsetTileZ(fieldSystem->landDataMan)) / MAP_TILES_COUNT_Z;
-    v3 = PlayerAvatar_GetDir(fieldSystem->playerAvatar);
+    OverworldMapHistory *mapHistory = FieldOverworldState_GetMapHistory(SaveData_GetFieldOverworldState(fieldSystem->saveData));
+    int mapX = (Player_GetXPos(fieldSystem->playerAvatar) - LandDataManager_GetOffsetTileX(fieldSystem->landDataMan)) / MAP_TILES_COUNT_X;
+    int mapZ = (Player_GetZPos(fieldSystem->playerAvatar) - LandDataManager_GetOffsetTileZ(fieldSystem->landDataMan)) / MAP_TILES_COUNT_Z;
+    int faceDirection = PlayerAvatar_GetDir(fieldSystem->playerAvatar);
 
-    sub_02055740(v0, v1, v2, v3);
+    OverworldMapHistory_Push(mapHistory, mapX, mapZ, faceDirection);
 }
 
 static void ov5_021D1414(void)
diff --git a/src/overworld_map_history.c b/src/overworld_map_history.c
new file mode 100644
index 0000000000..c2ee923778
--- /dev/null
+++ b/src/overworld_map_history.c
@@ -0,0 +1,51 @@
+#include "overworld_map_history.h"
+
+#include <nitro.h>
+#include <string.h>
+
+#include "constants/field/map.h"
+
+void OverworldMapHistory_Clear(OverworldMapHistory *mapHistory)
+{
+    for (u8 i = 0; i < 6; i++) {
+        mapHistory->items[i].mapX = 0;
+        mapHistory->items[i].mapZ = 0;
+        mapHistory->items[i].faceDirection = 0;
+        mapHistory->items[i].dummy_03 = 0;
+    }
+
+    mapHistory->historyPointer = 0;
+    mapHistory->currentMapX = 0;
+    mapHistory->currentMapZ = 0;
+}
+
+void OverworldMapHistory_PushViaWarp(OverworldMapHistory *mapHistory, int x, int z)
+{
+    u8 mapX = x / MAP_TILES_COUNT_X;
+    u8 mapZ = z / MAP_TILES_COUNT_Z;
+
+    if (mapX != mapHistory->currentMapX || mapZ != mapHistory->currentMapZ) {
+        mapHistory->items[mapHistory->historyPointer].mapX = mapX;
+        mapHistory->items[mapHistory->historyPointer].mapZ = mapZ;
+        mapHistory->items[mapHistory->historyPointer].faceDirection = -1;
+        mapHistory->items[mapHistory->historyPointer].dummy_03 = 1;
+        mapHistory->historyPointer = (mapHistory->historyPointer + 1) % 6;
+    }
+}
+
+void OverworldMapHistory_Push(OverworldMapHistory *mapHistory, int x, int z, int faceDirection)
+{
+    u8 mapX = x;
+    u8 mapZ = z;
+
+    if (mapX != mapHistory->currentMapX || mapZ != mapHistory->currentMapZ) {
+        mapHistory->items[mapHistory->historyPointer].mapX = mapX;
+        mapHistory->items[mapHistory->historyPointer].mapZ = mapZ;
+        mapHistory->items[mapHistory->historyPointer].faceDirection = faceDirection;
+        mapHistory->items[mapHistory->historyPointer].dummy_03 = 1;
+
+        mapHistory->currentMapX = mapX;
+        mapHistory->currentMapZ = mapZ;
+        mapHistory->historyPointer = (mapHistory->historyPointer + 1) % 6;
+    }
+}
diff --git a/src/player_avatar.c b/src/player_avatar.c
index 093b000dcd..0195caca01 100644
--- a/src/player_avatar.c
+++ b/src/player_avatar.c
@@ -453,7 +453,7 @@ void sub_0205EC20(PlayerAvatar *playerAvatar, u32 param1, int param2)
 
 void PlayerData_Init(PlayerData *playerData)
 {
-    playerData->unk_00 = 0;
+    playerData->cyclingGear = 0;
     playerData->runningShoes = FALSE;
     playerData->form = 0x0;
 }
@@ -484,13 +484,13 @@ int PlayerData_CyclingGear(PlayerData *playerData)
         return 0;
     }
 
-    return playerData->unk_00;
+    return playerData->cyclingGear;
 }
 
 void PlayerData_SetCyclingGear(PlayerData *playerData, int gear)
 {
     if (playerData != NULL) {
-        playerData->unk_00 = gear;
+        playerData->cyclingGear = gear;
     }
 }
 
diff --git a/src/unk_0203D1B8.c b/src/unk_0203D1B8.c
index 3fdac2ff93..62021a12cf 100644
--- a/src/unk_0203D1B8.c
+++ b/src/unk_0203D1B8.c
@@ -29,7 +29,6 @@
 #include "struct_defs/struct_0203E608.h"
 #include "struct_defs/struct_0203E6C0.h"
 #include "struct_defs/struct_02042434.h"
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/struct_020684D0.h"
 #include "struct_defs/struct_0206BC70.h"
 #include "struct_defs/struct_02072014.h"
@@ -98,6 +97,7 @@
 #include "mail.h"
 #include "math_util.h"
 #include "overlay_manager.h"
+#include "overworld_map_history.h"
 #include "party.h"
 #include "player_avatar.h"
 #include "pokedex.h"
@@ -737,7 +737,7 @@ void *sub_0203D8AC(FieldSystem *fieldSystem)
     UnkStruct_0203D8AC *v0;
     TrainerInfo *v1;
     int v2 = 0, v3 = 0;
-    sub_0203A76C(SaveData_GetFieldOverworldState(fieldSystem->saveData));
+    FieldOverworldState_GetMapHistory(SaveData_GetFieldOverworldState(fieldSystem->saveData));
 
     v0 = Heap_AllocFromHeapAtEnd(HEAP_ID_FIELDMAP, sizeof(UnkStruct_0203D8AC));
 
diff --git a/src/unk_020556C4.c b/src/unk_020556C4.c
deleted file mode 100644
index aff1ec7654..0000000000
--- a/src/unk_020556C4.c
+++ /dev/null
@@ -1,53 +0,0 @@
-#include "unk_020556C4.h"
-
-#include <nitro.h>
-#include <string.h>
-
-#include "struct_defs/struct_020556C4.h"
-
-void sub_020556C4(UnkStruct_020556C4 *param0)
-{
-    u8 v0;
-
-    for (v0 = 0; v0 < 6; v0++) {
-        param0->unk_06[v0].unk_00 = 0;
-        param0->unk_06[v0].unk_01 = 0;
-        param0->unk_06[v0].unk_02 = 0;
-        param0->unk_06[v0].unk_03 = 0;
-    }
-
-    param0->unk_00 = 0;
-    param0->unk_04 = 0;
-    param0->unk_05 = 0;
-}
-
-void sub_020556E8(UnkStruct_020556C4 *param0, int param1, int param2)
-{
-    u8 v0 = param1 / 32;
-    u8 v1 = param2 / 32;
-
-    if ((v0 != param0->unk_04) || (v1 != param0->unk_05)) {
-        param0->unk_06[param0->unk_00].unk_00 = v0;
-        param0->unk_06[param0->unk_00].unk_01 = v1;
-        param0->unk_06[param0->unk_00].unk_02 = -1;
-        param0->unk_06[param0->unk_00].unk_03 = 1;
-        param0->unk_00 = (param0->unk_00 + 1) % 6;
-    }
-}
-
-void sub_02055740(UnkStruct_020556C4 *param0, int param1, int param2, int param3)
-{
-    u8 v0 = param1, v1;
-    v1 = param2;
-
-    if ((v0 != param0->unk_04) || (v1 != param0->unk_05)) {
-        param0->unk_06[param0->unk_00].unk_00 = v0;
-        param0->unk_06[param0->unk_00].unk_01 = v1;
-        param0->unk_06[param0->unk_00].unk_02 = param3;
-        param0->unk_06[param0->unk_00].unk_03 = 1;
-
-        param0->unk_04 = v0;
-        param0->unk_05 = v1;
-        param0->unk_00 = (param0->unk_00 + 1) % 6;
-    }
-}
diff --git a/src/unk_0206B70C.c b/src/unk_0206B70C.c
index 280f72778a..2d8ec16849 100644
--- a/src/unk_0206B70C.c
+++ b/src/unk_0206B70C.c
@@ -7,7 +7,6 @@
 
 #include "struct_decls/struct_0203A790_decl.h"
 #include "struct_defs/struct_0203D8AC.h"
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/union_0206B878.h"
 
 #include "field/field_system.h"
@@ -19,6 +18,7 @@
 #include "location.h"
 #include "map_header.h"
 #include "map_matrix.h"
+#include "overworld_map_history.h"
 #include "player_avatar.h"
 #include "save_player.h"
 #include "script_manager.h"
@@ -77,7 +77,7 @@ void sub_0206B70C(FieldSystem *fieldSystem, UnkStruct_0203D8AC *param1, int para
     TrainerInfo *v0;
     int v1 = 0, v2 = 0, v3 = 0;
     int x, z, v6;
-    UnkStruct_020556C4 *v7;
+    OverworldMapHistory *v7;
     VarsFlags *v8 = SaveData_GetVarsFlags(fieldSystem->saveData);
     FieldOverworldState *fieldState = SaveData_GetFieldOverworldState(fieldSystem->saveData);
     Location *v10 = FieldOverworldState_GetExitLocation(fieldState);
@@ -114,18 +114,18 @@ void sub_0206B70C(FieldSystem *fieldSystem, UnkStruct_0203D8AC *param1, int para
 
     v0 = SaveData_GetTrainerInfo(FieldSystem_GetSaveData(fieldSystem));
     param1->unk_0C = TrainerInfo_Gender(v0);
-    v7 = sub_0203A76C(SaveData_GetFieldOverworldState(fieldSystem->saveData));
-    v2 = (v7->unk_00 - 2 + 6) % 6;
+    v7 = FieldOverworldState_GetMapHistory(SaveData_GetFieldOverworldState(fieldSystem->saveData));
+    v2 = (v7->historyPointer - 2 + 6) % 6;
 
     for (v1 = 0; v1 < 5; v1++) {
-        param1->unk_20[v1].unk_00 = v7->unk_06[v2].unk_00;
-        param1->unk_20[v1].unk_04 = v7->unk_06[v2].unk_01;
-        param1->unk_20[v1].unk_0A = v7->unk_06[v2].unk_03;
+        param1->unk_20[v1].unk_00 = v7->items[v2].mapX;
+        param1->unk_20[v1].unk_04 = v7->items[v2].mapZ;
+        param1->unk_20[v1].unk_0A = v7->items[v2].dummy_03;
 
-        if (v7->unk_06[v2].unk_02 > 3) {
+        if (v7->items[v2].faceDirection > 3) {
             param1->unk_20[v1].unk_08 = 3 + 1;
         } else {
-            param1->unk_20[v1].unk_08 = v7->unk_06[v2].unk_02;
+            param1->unk_20[v1].unk_08 = v7->items[v2].faceDirection;
         }
 
         v2 = (v2 - 1 + 6) % 6;
diff --git a/src/unk_02070428.c b/src/unk_02070428.c
index 9d8d2e4c8d..bcf093c78e 100644
--- a/src/unk_02070428.c
+++ b/src/unk_02070428.c
@@ -4,7 +4,6 @@
 #include <string.h>
 
 #include "struct_defs/special_encounter.h"
-#include "struct_defs/struct_020556C4.h"
 #include "struct_defs/struct_0205EC34.h"
 
 #include "field/field_system.h"
@@ -14,6 +13,7 @@
 #include "journal.h"
 #include "location.h"
 #include "map_header.h"
+#include "overworld_map_history.h"
 #include "player_avatar.h"
 #include "roaming_pokemon.h"
 #include "save_player.h"
@@ -21,7 +21,6 @@
 #include "system_flags.h"
 #include "system_vars.h"
 #include "unk_0203A7D8.h"
-#include "unk_020556C4.h"
 #include "vars_flags.h"
 
 static BOOL sub_020705DC(FieldSystem *fieldSystem);
@@ -98,10 +97,8 @@ void FieldSystem_InitFlagsWarp(FieldSystem *fieldSystem)
     }
 
     if (MapHeader_IsOnMainMatrix(fieldSystem->location->mapId)) {
-        UnkStruct_020556C4 *v3;
-
-        v3 = sub_0203A76C(SaveData_GetFieldOverworldState(fieldSystem->saveData));
-        sub_020556E8(v3, fieldSystem->location->x, fieldSystem->location->z);
+        OverworldMapHistory *mapHistory = FieldOverworldState_GetMapHistory(SaveData_GetFieldOverworldState(fieldSystem->saveData));
+        OverworldMapHistory_PushViaWarp(mapHistory, fieldSystem->location->x, fieldSystem->location->z);
     }
 }