diff --git a/asm/region_map.s b/asm/region_map.s
index e651b6b5fe..7357f463e7 100644
--- a/asm/region_map.s
+++ b/asm/region_map.s
@@ -5,136 +5,6 @@
 
 	.text
 
-	thumb_func_start sub_8123418
-sub_8123418: @ 8123418
-	push {r4-r6,lr}
-	ldr r1, =gUnknown_0203A144
-	ldr r2, [r1]
-	adds r0, r2, 0
-	adds r0, 0x78
-	ldrb r3, [r0]
-	adds r5, r1, 0
-	cmp r3, 0
-	bne _0812349C
-	subs r0, 0x1A
-	strh r3, [r0]
-	subs r0, 0x2
-	strh r3, [r0]
-	str r3, [r2, 0x40]
-	str r3, [r2, 0x3C]
-	adds r4, r2, 0
-	adds r4, 0x54
-	ldrh r0, [r4]
-	lsls r0, 3
-	subs r0, 0x34
-	adds r1, r2, 0
-	adds r1, 0x60
-	strh r0, [r1]
-	movs r0, 0x56
-	adds r0, r2
-	mov r12, r0
-	ldrh r0, [r0]
-	lsls r0, 3
-	subs r0, 0x44
-	adds r3, r2, 0
-	adds r3, 0x62
-	strh r0, [r3]
-	movs r6, 0
-	ldrsh r0, [r1, r6]
-	lsls r0, 8
-	cmp r0, 0
-	bge _08123464
-	adds r0, 0xF
-_08123464:
-	asrs r0, 4
-	str r0, [r2, 0x44]
-	movs r1, 0
-	ldrsh r0, [r3, r1]
-	lsls r0, 8
-	cmp r0, 0
-	bge _08123474
-	adds r0, 0xF
-_08123474:
-	asrs r0, 4
-	str r0, [r2, 0x48]
-	ldrh r1, [r4]
-	adds r0, r2, 0
-	adds r0, 0x64
-	strh r1, [r0]
-	mov r3, r12
-	ldrh r0, [r3]
-	adds r1, r2, 0
-	adds r1, 0x66
-	strh r0, [r1]
-	movs r0, 0x80
-	lsls r0, 9
-	str r0, [r2, 0x4C]
-	ldr r0, =0xfffff800
-	b _081234FA
-	.pool
-_0812349C:
-	adds r0, r2, 0
-	adds r0, 0x5C
-	movs r6, 0
-	ldrsh r0, [r0, r6]
-	lsls r0, 8
-	str r0, [r2, 0x3C]
-	adds r0, r2, 0
-	adds r0, 0x5E
-	movs r1, 0
-	ldrsh r0, [r0, r1]
-	lsls r0, 8
-	str r0, [r2, 0x40]
-	adds r0, r2, 0
-	adds r0, 0x60
-	movs r1, 0
-	strh r1, [r0]
-	adds r0, 0x2
-	strh r1, [r0]
-	ldr r0, [r2, 0x3C]
-	cmp r0, 0
-	bge _081234C8
-	adds r0, 0xF
-_081234C8:
-	asrs r0, 4
-	negs r0, r0
-	str r0, [r2, 0x44]
-	ldr r0, [r2, 0x40]
-	cmp r0, 0
-	bge _081234D6
-	adds r0, 0xF
-_081234D6:
-	asrs r0, 4
-	negs r0, r0
-	str r0, [r2, 0x48]
-	adds r0, r2, 0
-	adds r0, 0x64
-	ldrh r1, [r0]
-	subs r0, 0x10
-	strh r1, [r0]
-	adds r0, 0x12
-	ldrh r0, [r0]
-	adds r1, r2, 0
-	adds r1, 0x56
-	strh r0, [r1]
-	movs r0, 0x80
-	lsls r0, 8
-	str r0, [r2, 0x4C]
-	movs r0, 0x80
-	lsls r0, 4
-_081234FA:
-	str r0, [r2, 0x50]
-	ldr r0, [r5]
-	adds r0, 0x6E
-	movs r1, 0
-	strh r1, [r0]
-	bl sub_8124238
-	bl sub_81243B0
-	pop {r4-r6}
-	pop {r0}
-	bx r0
-	thumb_func_end sub_8123418
-
 	thumb_func_start sub_8123514
 sub_8123514: @ 8123514
 	push {r4-r6,lr}
diff --git a/include/region_map.h b/include/region_map.h
index e2cac942cb..2269d21fa8 100644
--- a/include/region_map.h
+++ b/include/region_map.h
@@ -233,20 +233,27 @@ struct RegionMap {
     /*0x018*/ u8 (*inputCallback)(void);
     /*0x01c*/ struct Sprite *cursorSprite;
     /*0x020*/ struct Sprite *playerIconSprite;
-    /*0x024*/ u8 filler_024[0x30];
+    /*0x024*/ u8 filler_024[0x18];
+    /*0x03c*/ s32 unk_03c;
+    /*0x040*/ s32 unk_040;
+    /*0x044*/ s32 unk_044;
+    /*0x048*/ s32 unk_048;
+    /*0x04c*/ s32 unk_04c;
+    /*0x050*/ s32 unk_050;
     /*0x054*/ u16 cursorPosX;
     /*0x056*/ u16 cursorPosY;
     /*0x058*/ u16 cursorTileTag;
     /*0x05a*/ u16 cursorPaletteTag;
     /*0x05c*/ s16 scrollX;
     /*0x05e*/ s16 scrollY;
-    /*0x060*/ u8 filler_060[0x4];
+    /*0x060*/ s16 unk_060;
+    /*0x062*/ s16 unk_062;
     /*0x064*/ u16 unk_064;
     /*0x066*/ u16 unk_066;
     /*0x068*/ s16 zoomedCursorDeltaY;
     /*0x06a*/ s16 zoomedCursorDeltaX;
     /*0x06c*/ u16 zoomedCursorMovementFrameCounter;
-    /*0x06e*/ u8 filler_06e[2];
+    /*0x06e*/ u16 unk_06e;
     /*0x070*/ u16 playerIconTileTag;
     /*0x072*/ u16 playerIconPaletteTag;
     /*0x074*/ u16 unk_074;
diff --git a/src/region_map.c b/src/region_map.c
index caf6b32a14..9da4d7586d 100644
--- a/src/region_map.c
+++ b/src/region_map.c
@@ -32,6 +32,8 @@ u8 _swiopen(void);
 u8 sub_8123334(void);
 u16 sub_812386C(u16 x, u16 y);
 void sub_812378C(s16 x, s16 y);
+void sub_8124238(void);
+void sub_81243B0(void);
 
 // .rodata
 
@@ -344,8 +346,40 @@ u8 sub_8123334(void)
         gUnknown_0203A144->inputCallback = sub_8123254;
         return INPUT_EVENT_MOVE_END;
     }
+    return INPUT_EVENT_MOVE_CONT;
+}
+
+void sub_8123418(void)
+{
+    if (gUnknown_0203A144->zoomed == FALSE)
+    {
+        gUnknown_0203A144->scrollY = 0;
+        gUnknown_0203A144->scrollX = 0;
+        gUnknown_0203A144->unk_040 = 0;
+        gUnknown_0203A144->unk_03c = 0;
+        gUnknown_0203A144->unk_060 = gUnknown_0203A144->cursorPosX * 8 - 0x34;
+        gUnknown_0203A144->unk_062 = gUnknown_0203A144->cursorPosY * 8 - 0x44;
+        gUnknown_0203A144->unk_044 = (gUnknown_0203A144->unk_060 << 8) / 16;
+        gUnknown_0203A144->unk_048 = (gUnknown_0203A144->unk_062 << 8) / 16;
+        gUnknown_0203A144->unk_064 = gUnknown_0203A144->cursorPosX;
+        gUnknown_0203A144->unk_066 = gUnknown_0203A144->cursorPosY;
+        gUnknown_0203A144->unk_04c = 0x10000;
+        gUnknown_0203A144->unk_050 = -0x800;
+    }
     else
     {
-        return INPUT_EVENT_MOVE_CONT;
+        gUnknown_0203A144->unk_03c = gUnknown_0203A144->scrollX * 256;
+        gUnknown_0203A144->unk_040 = gUnknown_0203A144->scrollY * 256;
+        gUnknown_0203A144->unk_060 = 0;
+        gUnknown_0203A144->unk_062 = 0;
+        gUnknown_0203A144->unk_044 = -(gUnknown_0203A144->unk_03c / 16);
+        gUnknown_0203A144->unk_048 = -(gUnknown_0203A144->unk_040 / 16);
+        gUnknown_0203A144->cursorPosX = gUnknown_0203A144->unk_064;
+        gUnknown_0203A144->cursorPosY = gUnknown_0203A144->unk_066;
+        gUnknown_0203A144->unk_04c = 0x8000;
+        gUnknown_0203A144->unk_050 = 0x800;
     }
+    gUnknown_0203A144->unk_06e = 0;
+    sub_8124238();
+    sub_81243B0();
 }