diff --git a/asm/include/overlay_01_021F8D80.inc b/asm/include/overlay_01_021F8D80.inc
index cb95bc15a..d7c32fcf5 100644
--- a/asm/include/overlay_01_021F8D80.inc
+++ b/asm/include/overlay_01_021F8D80.inc
@@ -16,7 +16,7 @@
 .public MapObjectManager_SetFlagsBits
 .public MapObjectManager_ClearFlagsBits
 .public MapObjectManager_GetFlagsBitsMask
-.public MapObjectManager_GetHeapID
+.public MapObjectManager_GetPriority
 .public sub_0205F1A0
 .public FldObjSys_SetMModelNarc
 .public FldObjSys_GetMModelNarc
diff --git a/asm/include/overlay_01_021F944C.inc b/asm/include/overlay_01_021F944C.inc
index d811c4a01..5032e434f 100644
--- a/asm/include/overlay_01_021F944C.inc
+++ b/asm/include/overlay_01_021F944C.inc
@@ -48,7 +48,7 @@
 .public sub_0205EEF4
 .public sub_0205F09C
 .public MapObjectManager_GetObjectCount
-.public MapObjectManager_GetHeapID
+.public MapObjectManager_GetPriority
 .public sub_0205F1A0
 .public sub_0205F1AC
 .public sub_0205F1C4
diff --git a/asm/include/overlay_01_021FD41C.inc b/asm/include/overlay_01_021FD41C.inc
index 100c46eee..672564788 100644
--- a/asm/include/overlay_01_021FD41C.inc
+++ b/asm/include/overlay_01_021FD41C.inc
@@ -5,7 +5,7 @@
 .public GF_RTC_GetTimeOfDay
 .public sub_0205F09C
 .public sub_0205F0F8
-.public MapObjectManager_GetHeapID
+.public MapObjectManager_GetPriority
 .public MapObject_TestFlagsBits
 .public MapObject_GetID
 .public sub_0205F254
diff --git a/asm/include/unk_02062108.inc b/asm/include/unk_02062108.inc
index bd37b7d5a..fb0c71cd5 100644
--- a/asm/include/unk_02062108.inc
+++ b/asm/include/unk_02062108.inc
@@ -7,7 +7,7 @@
 .public FreeToHeapExplicit
 .public SysTask_GetData
 .public GF_AssertFail
-.public MapObjectManager_GetHeapID
+.public MapObjectManager_GetPriority
 .public MapObject_SetFlagsBits
 .public MapObject_ClearFlagsBits
 .public MapObject_TestFlagsBits
diff --git a/asm/overlay_01_021F8D80.s b/asm/overlay_01_021F8D80.s
index 9764063e4..93ba50346 100644
--- a/asm/overlay_01_021F8D80.s
+++ b/asm/overlay_01_021F8D80.s
@@ -664,7 +664,7 @@ _021F9212:
 	bl MapObjectManager_GetObjectCount
 	str r0, [sp, #0x14]
 	add r0, r5, #0
-	bl MapObjectManager_GetHeapID
+	bl MapObjectManager_GetPriority
 	sub r0, r0, #1
 	str r0, [sp, #0x10]
 	add r0, r5, #0
diff --git a/asm/overlay_01_021F944C.s b/asm/overlay_01_021F944C.s
index e4b6196d4..2fe4684b9 100644
--- a/asm/overlay_01_021F944C.s
+++ b/asm/overlay_01_021F944C.s
@@ -2934,7 +2934,7 @@ _021FA882:
 	str r4, [r5, r0]
 	add r0, r0, #4
 	ldr r0, [r5, r0]
-	bl MapObjectManager_GetHeapID
+	bl MapObjectManager_GetPriority
 	add r6, r0, #0
 	ldr r0, _021FA8E8 ; =ov01_021FA564
 	add r1, r5, #0
@@ -3245,7 +3245,7 @@ _021FAB4A:
 	mov r0, #0x41
 	lsl r0, r0, #2
 	ldr r0, [r7, r0]
-	bl MapObjectManager_GetHeapID
+	bl MapObjectManager_GetPriority
 	ldr r0, _021FAB98 ; =ov01_021FAB9C
 	add r1, r5, #0
 	mov r2, #0xff
diff --git a/asm/overlay_01_021FD41C.s b/asm/overlay_01_021FD41C.s
index dfdf5e393..ea96dfae9 100644
--- a/asm/overlay_01_021FD41C.s
+++ b/asm/overlay_01_021FD41C.s
@@ -53,7 +53,7 @@ ov01_021FD458: ; 0x021FD458
 	ldr r0, [r4, #0x20]
 	bl ov01_021F1468
 	ldr r0, [r0, #0x3c]
-	bl MapObjectManager_GetHeapID
+	bl MapObjectManager_GetPriority
 	sub r2, r0, #1
 	ldr r0, _021FD478 ; =ov01_021FD4F4
 	add r1, r4, #0
diff --git a/asm/unk_02062108.s b/asm/unk_02062108.s
index 70a105404..05005d531 100644
--- a/asm/unk_02062108.s
+++ b/asm/unk_02062108.s
@@ -188,7 +188,7 @@ _02062230:
 	bne _02062230
 	add r0, r5, #0
 	bl MapObject_GetManager
-	bl MapObjectManager_GetHeapID
+	bl MapObjectManager_GetPriority
 	sub r2, r0, #1
 	ldr r0, _0206225C ; =MovementScriptMachine
 	add r1, r4, #0
diff --git a/include/map_object.h b/include/map_object.h
index 7edd0d452..55f0517dc 100644
--- a/include/map_object.h
+++ b/include/map_object.h
@@ -34,7 +34,7 @@ struct MapObjectManager { //declared field_system.h
     u32 flags;
     u32 object_count;
     u32 unk8;
-    HeapID heapId;
+    u32 priority;
     u8 unk10[4];
     NARC* mmodel_narc;
     u8 unk18[4];
@@ -161,7 +161,7 @@ typedef struct MapObjectInitArgs {
 } MapObjectInitArgs;
 
 // FIXME: Some of these declarations are static and don't belong in here.
-MapObjectManager *MapObjectManager_Init(FieldSystem *fieldSystem, u32 objectCount, HeapID heapId);
+MapObjectManager *MapObjectManager_Init(FieldSystem *fieldSystem, u32 objectCount, u32 priority);
 void MapObjectManager_Delete(MapObjectManager *manager);
 void sub_0205E104(MapObjectManager *manager, u32 unused, u32 a2, u32 objectCount, ObjectEvent* objectEvents);
 LocalMapObject *MapObject_Create(MapObjectManager *manager, u32 x, u32 z, u32 direction, u32 sprite, u32 movement, u32 mapNo);
@@ -179,10 +179,6 @@ void sub_0205E580(MapObjectManager *manager);
 void FieldSystem_SyncMapObjectsToSaveEx(FieldSystem *fieldSystem, MapObjectManager *manager, SavedMapObject *savedObjects, s32 count);
 void MapObjectManager_RestoreFromSave(MapObjectManager *mapObjectManager, SavedMapObject *savedObjects, u32 objectCount);
 void MapObject_CreateFromMultipleObjectEvents(MapObjectManager *manager, u32 mapNo, u32 objectEventCount, ObjectEvent *objectEvents);
-void sub_0205EA08(struct MapObjectInitArgs* args);
-LocalMapObject* MapObjectManager_GetFirstInactiveObject(MapObjectManager*);
-LocalMapObject* sub_0205EA98(MapObjectManager*, u32, u32);
-void sub_0205EAF0(MapObjectManager* manager, LocalMapObject* object);
 void MapObject_InitFromObjectEvent(LocalMapObject* object, ObjectEvent* template, FieldSystem* fieldSystem);
 void MapObject_SetPositionVecFromTemplate(LocalMapObject* object, ObjectEvent* template);
 void sub_0205EC90(LocalMapObject* object, MapObjectManager* manager);
@@ -215,8 +211,8 @@ void sub_0205F174(MapObjectManager* manager);
 void MapObjectManager_SetFlagsBits(MapObjectManager* manager, u32 bits);
 void MapObjectManager_ClearFlagsBits(MapObjectManager* manager, u32 bits);
 u32 MapObjectManager_GetFlagsBitsMask(MapObjectManager* manager, u32 bits);
-void MapObjectManager_SetHeapID(MapObjectManager*, HeapID);
-HeapID MapObjectManager_GetHeapID(MapObjectManager* manager);
+void MapObjectManager_SetPriority(MapObjectManager* manager, u32 priority);
+u32 MapObjectManager_GetPriority(MapObjectManager* manager);
 void* sub_0205F1A0(MapObjectManager*);
 void MapObjectManager_SetObjects(MapObjectManager* manager, LocalMapObject* objects);
 LocalMapObject* sub_0205F1AC(MapObjectManager* manager);
diff --git a/src/field_warp_tasks.c b/src/field_warp_tasks.c
index 327e93722..0582d3a2a 100644
--- a/src/field_warp_tasks.c
+++ b/src/field_warp_tasks.c
@@ -223,7 +223,7 @@ static void sub_0205316C(FieldSystem *fieldSystem) {
         playerSaveData = LocalFieldData_GetPlayer(Save_LocalFieldData_Get(fieldSystem->saveData));
         fieldSystem->playerAvatar = sub_0205C390(fieldSystem->mapObjectManager, fieldSystem->location->x, fieldSystem->location->y, fieldSystem->location->direction, playerSaveData->unk4, gender, 2, playerSaveData);
     } else {
-        fieldSystem->mapObjectManager = MapObjectManager_Init(fieldSystem, 64, HEAP_ID_BATTLE);
+        fieldSystem->mapObjectManager = MapObjectManager_Init(fieldSystem, 64, 5);
         gender = PlayerProfile_GetTrainerGender(Save_PlayerData_GetProfileAddr(fieldSystem->saveData));
         playerSaveData = LocalFieldData_GetPlayer(Save_LocalFieldData_Get(fieldSystem->saveData));
         fieldSystem->playerAvatar = sub_0205C390(fieldSystem->mapObjectManager, fieldSystem->location->x, fieldSystem->location->y, fieldSystem->location->direction, playerSaveData->unk4, gender, 2, playerSaveData);
@@ -248,7 +248,7 @@ static void sub_0205323C(FieldSystem *fieldSystem) {
     u32 gender;
     struct PlayerSaveData *playerSaveData;
 
-    fieldSystem->mapObjectManager = MapObjectManager_Init(fieldSystem, 64, HEAP_ID_BATTLE);
+    fieldSystem->mapObjectManager = MapObjectManager_Init(fieldSystem, 64, 5);
     FieldSystem_RestoreMapObjectsFromSave(fieldSystem);
     playerSaveData = LocalFieldData_GetPlayer(Save_LocalFieldData_Get(fieldSystem->saveData));
     gender = PlayerProfile_GetTrainerGender(Save_PlayerData_GetProfileAddr(fieldSystem->saveData));
diff --git a/src/map_object.c b/src/map_object.c
index 6a7cf9b03..49184e26e 100644
--- a/src/map_object.c
+++ b/src/map_object.c
@@ -17,15 +17,19 @@ static void LocalMapObject_InitFromSavedMapObject(LocalMapObject *localObject, S
 static void sub_0205E8EC(MapObjectManager *manager, LocalMapObject *object);
 static void sub_0205E934(LocalMapObject *object);
 static void MapObject_ConvertXYToPositionVec(LocalMapObject *object);
+static void MapObject_CreateFromInitArgs(MapObjectInitArgs *args);
+static LocalMapObject *MapObjectManager_GetFirstInactiveObject(MapObjectManager *manager);
+static LocalMapObject *sub_0205EA98(MapObjectManager *manager, u32 id, u32 mapNo);
+static void sub_0205EAF0(MapObjectManager *manager, LocalMapObject *object);
 
 static void sub_0205ED18(LocalMapObject *object);
 static void sub_0205EF8C(LocalMapObject *object);
 
-MapObjectManager *MapObjectManager_Init(FieldSystem *fieldSystem, u32 objectCount, HeapID heapId) {
+MapObjectManager *MapObjectManager_Init(FieldSystem *fieldSystem, u32 objectCount, u32 priority) {
     MapObjectManager *ret = MapObjectManager_New(objectCount);
     MapObjectManager_SetFieldSystemPtr(ret, fieldSystem);
     MapObjectManager_SetObjectCount(ret, objectCount);
-    MapObjectManager_SetHeapID(ret, heapId);
+    MapObjectManager_SetPriority(ret, priority);
 
     return ret;
 }
@@ -442,48 +446,48 @@ void MapObject_CreateFromMultipleObjectEvents(MapObjectManager *manager, u32 map
     args->manager = manager;
     args->objectEvents = objectEventsCopy;
 
-    sub_0205EA08(args);
+    MapObject_CreateFromInitArgs(args);
 }
 
-void sub_0205EA08(struct MapObjectInitArgs* args) {
-    FieldSystem* fieldSystem = MapObjectManager_GetFieldSystemPtr(args->manager);
-    ObjectEvent* template = args->objectEvents;
+static void MapObject_CreateFromInitArgs(MapObjectInitArgs *args) {
+    FieldSystem *fieldSystem = MapObjectManager_GetFieldSystemPtr(args->manager);
+    ObjectEvent *objectEvents = args->objectEvents;
 
     do {
-        GF_ASSERT((ObjectEvent_ScriptIdIsUnset(template) != TRUE && FieldSystem_FlagCheck(fieldSystem, template->flag) != FALSE) ||
-                  MapObject_CreateFromObjectEvent(args->manager, template, args->mapNo) != NULL);
+        GF_ASSERT((ObjectEvent_ScriptIdIsUnset(objectEvents) != TRUE && FieldSystem_FlagCheck(fieldSystem, objectEvents->flag) != FALSE) ||
+                  MapObject_CreateFromObjectEvent(args->manager, objectEvents, args->mapNo) != NULL);
 
-        template++;
+        objectEvents++;
         args->index++;
     } while (args->index < args->objectEventCount);
 
-    FreeToHeapExplicit((HeapID)11, args->objectEvents);
-    FreeToHeapExplicit((HeapID)11, args);
+    FreeToHeapExplicit(HEAP_ID_FIELD, args->objectEvents);
+    FreeToHeapExplicit(HEAP_ID_FIELD, args);
 }
 
-LocalMapObject* MapObjectManager_GetFirstInactiveObject(MapObjectManager* manager) {
-    int i = 0;
-    int count = MapObjectManager_GetObjectCount(manager);
-    LocalMapObject* object = MapObjectManager_GetObjects(manager);
+static LocalMapObject *MapObjectManager_GetFirstInactiveObject(MapObjectManager *manager) {
+    s32 i = 0;
+    s32 count = MapObjectManager_GetObjectCount(manager);
+    LocalMapObject *objects = MapObjectManager_GetObjects(manager);
 
     do {
-        if (MapObject_GetFlagsBits(object, MAPOBJECTFLAG_ACTIVE) == 0) {
-            return object;
+        if (MapObject_GetFlagsBits(objects, MAPOBJECTFLAG_ACTIVE) == 0) {
+            return objects;
         }
 
         i++;
-        object++;
+        objects++;
     } while (i < count);
 
     return NULL;
 }
 
-LocalMapObject* sub_0205EA98(MapObjectManager* manager, u32 id, u32 map_no) {
-    int index = 0;
-    LocalMapObject* object;
+static LocalMapObject *sub_0205EA98(MapObjectManager *manager, u32 id, u32 mapNo) { //find corresponding LMO with ID and mapNo?
+    s32 index = 0;
+    LocalMapObject *object;
 
     while (sub_0205EEF4(manager, &object, &index, MAPOBJECTFLAG_ACTIVE) == TRUE) {
-        if (MapObject_CheckFlag25(object) == TRUE && id == MapObject_GetID(object) && map_no == sub_0205F544(object)) {
+        if (MapObject_CheckFlag25(object) == TRUE && MapObject_GetID(object) == id && sub_0205F544(object) == mapNo) {
             return object;
         }
     }
@@ -491,14 +495,14 @@ LocalMapObject* sub_0205EA98(MapObjectManager* manager, u32 id, u32 map_no) {
     return NULL;
 }
 
-void sub_0205EAF0(MapObjectManager* manager, LocalMapObject* object) {
-    u32 priority = MapObjectManager_GetHeapID(manager);
+static void sub_0205EAF0(MapObjectManager *manager, LocalMapObject *object) {
+    u32 priority = MapObjectManager_GetPriority(manager);
     u32 movement = MapObject_GetMovement(object);
     if (movement == 48 || movement == 50) {
         priority += 2;
     }
 
-    SysTask* task = SysTask_CreateOnMainQueue((SysTaskFunc)sub_0205F12C, object, priority);
+    SysTask *task = SysTask_CreateOnMainQueue((SysTaskFunc)sub_0205F12C, object, priority);
     GF_ASSERT(task != NULL);
 
     sub_0205F338(object, task);
@@ -839,12 +843,12 @@ u32 MapObjectManager_GetFlagsBitsMask(MapObjectManager* manager, u32 bits) {
     return manager->flags & bits;
 }
 
-void MapObjectManager_SetHeapID(MapObjectManager* manager, HeapID heapId) {
-    manager->heapId = heapId;
+void MapObjectManager_SetPriority(MapObjectManager* manager, u32 priority) {
+    manager->priority = priority;
 }
 
-HeapID MapObjectManager_GetHeapID(MapObjectManager* manager) {
-    return manager->heapId;
+u32 MapObjectManager_GetPriority(MapObjectManager* manager) {
+    return manager->priority;
 }
 
 void* sub_0205F1A0(MapObjectManager* manager) {
@@ -1270,8 +1274,8 @@ FieldSystem* MapObject_GetFieldSystemPtr(LocalMapObject* object) {
     return MapObjectManager_GetFieldSystemPtr(sub_0205F364(object));
 }
 
-void* sub_0205F538(LocalMapObject* object) {
-    return (void*)MapObjectManager_GetHeapID(MapObject_GetManager(object));
+void* sub_0205F538(LocalMapObject* object) { //TODO: this is not void
+    return (void*)MapObjectManager_GetPriority(MapObject_GetManager(object));
 }
 
 u32 sub_0205F544(LocalMapObject* object) {