diff --git a/src/viewport.c b/src/viewport.c
index 6602f23874..aefa7e31c6 100644
--- a/src/viewport.c
+++ b/src/viewport.c
@@ -34,7 +34,8 @@
 rct_viewport* g_viewport_list = RCT2_ADDRESS(RCT2_ADDRESS_VIEWPORT_LIST, rct_viewport);
 
 /**
- * 
+ *  This is not a viewport function. It is used to setup many variables for
+ *  multiple things.
  *  rct2: 0x006E6EAC
  */
 void viewport_init_all()
@@ -109,23 +110,25 @@ void center_2d_coordinates(int x, int y, int z, int* out_x, int* out_y, rct_view
 }
 
 /**
- * 
- *  rct2: 0x006EB009
- *  x:      ax
- *  y:      eax (top 16)
- *  width:  bx
- *  height: ebx (top 16)
- *  zoom:    cl (8 bits)
- *  ecx:    ecx (top 16 bits see zoom)
- *  edx:    edx
- *  w:      esi
- */
-void viewport_create(rct_window *w, int x, int y, int width, int height, int zoom, int ecx, int edx)
+*
+*  rct2: 0x006EB009
+*  x:      ax
+*  y:      eax (top 16)
+*  width:  bx
+*  height: ebx (top 16)
+*  zoom:    cl (8 bits)
+*  center_x: edx lower 16 bits
+*  center_y: edx upper 16 bits
+*  center_z: ecx upper 16 bits
+*  sprite: edx lower 16 bits
+*  flags:  edx top most 2 bits 0b_X1 for zoom clear see below for 2nd bit.
+*  w:      esi
+*
+*  Viewport will look at sprite or at coordinates as specified in flags 0b_1X for sprite 0b_0X for coordinates
+*/
+void viewport_create(rct_window *w, int x, int y, int width, int height, int zoom, int center_x, int center_y, int center_z, char flags, sint16 sprite)
 {
 	rct_viewport* viewport;
-	int eax = 0xFF000001;
-	int ebx = -1;
-
 	for (viewport = g_viewport_list; viewport->width != 0; viewport++){
 		if (viewport >= RCT2_ADDRESS(RCT2_ADDRESS_NEW_VIEWPORT_PTR, rct_viewport)){
 			error_string_quit(0xFF000001, -1);
@@ -137,10 +140,9 @@ void viewport_create(rct_window *w, int x, int y, int width, int height, int zoo
 	viewport->width = width;
 	viewport->height = height;
 
-	if (!(edx & (1 << 30))){
+	if (!(flags & (1 << 0))){
 		zoom = 0;
 	}
-	edx &= ~(1 << 30); 
 
 	viewport->view_width = width << zoom;
 	viewport->view_height = height << zoom;
@@ -151,20 +153,15 @@ void viewport_create(rct_window *w, int x, int y, int width, int height, int zoo
 		viewport->flags |= VIEWPORT_FLAG_GRIDLINES;
 	}
 	w->viewport = viewport;
-	int center_x, center_y, center_z;
 
-	if (edx & (1 << 31)){
-		edx &= 0xFFFF;
-		w->viewport_target_sprite = edx;
-		rct_sprite* sprite = &g_sprite_list[edx];
-		center_x = sprite->unknown.x;
-		center_y = sprite->unknown.y;
-		center_z = sprite->unknown.z;
+	if (flags & (1<<1)){
+		w->viewport_target_sprite = sprite;
+		rct_sprite* center_sprite = &g_sprite_list[sprite];
+		center_x = center_sprite->unknown.x;
+		center_y = center_sprite->unknown.y;
+		center_z = center_sprite->unknown.z;
 	}
 	else{
-		center_x = edx & 0xFFFF;
-		center_y = edx >> 16;
-		center_z = ecx >> 16;
 		w->viewport_target_sprite = SPR_NONE;
 	}
 
@@ -406,7 +403,6 @@ void sub_0x68B6C2(){
 		dx += 0x860;
 		dx >>= 5;
 		for (int i = dx; i > 0; i--){
-			int esi, ebp;
 			RCT2_CALLPROC_X(0x68B35F, ax, 0, cx, 0, 0, 0, 0);
 			RCT2_CALLPROC_X(0x69E8B0, ax, 0, cx, 0, 0, 0, 0);
 			ax += 0x20;
diff --git a/src/viewport.h b/src/viewport.h
index e3893d28a8..13019e953b 100644
--- a/src/viewport.h
+++ b/src/viewport.h
@@ -46,7 +46,7 @@ enum {
 extern rct_viewport* g_viewport_list;
 
 void viewport_init_all();
-void viewport_create(rct_window *w, int x, int y, int width, int height, int zoom, int ecx, int edx);
+void viewport_create(rct_window *w, int x, int y, int width, int height, int zoom, int center_x, int center_y, int center_z, char flags, sint16 sprite);
 void viewport_update_pointers();
 void viewport_update_position(rct_window *window);
 void viewport_render(rct_drawpixelinfo *dpi, rct_viewport *viewport, int left, int top, int right, int bottom);
diff --git a/src/window_banner.c b/src/window_banner.c
index 57d1dacc01..8ce11fbfe1 100644
--- a/src/window_banner.c
+++ b/src/window_banner.c
@@ -141,7 +141,10 @@ void window_banner_open()
 		(viewportWidget->bottom - viewportWidget->top) - 2,
 		0,
 		100,	// TODO: needs banner map position
-		100		// TODO: needs banner map position
+		100,		// TODO: needs banner map position
+		100,
+		0,
+		-1
 	);
 
 	w->viewport->flags = (RCT2_GLOBAL(RCT2_ADDRESS_CONFIG_FLAGS, uint8) & CONFIG_FLAG_ALWAYS_SHOW_GRIDLINES) ? VIEWPORT_FLAG_GRIDLINES : 0;
diff --git a/src/window_main.c b/src/window_main.c
index 7f375dd578..fd3c70eb42 100644
--- a/src/window_main.c
+++ b/src/window_main.c
@@ -81,7 +81,7 @@ void window_main_open()
 	);
 	window->widgets = window_main_widgets;
 
-	viewport_create(window, window->x, window->y, window->width, window->height, 0, 0x40000000, 0x0FFF0FFF);
+	viewport_create(window, window->x, window->y, window->width, window->height, 0,0x0FFF,0x0FFF, 0, 0x1, -1);
 	window->viewport->flags |= 0x0400;
 	RCT2_GLOBAL(RCT2_ADDRESS_CURRENT_ROTATION, sint32) = 0;
 	RCT2_GLOBAL(0x009E32B0, uint8) = 0;
diff --git a/src/window_park.c b/src/window_park.c
index ed2f02e2e2..b26b6da656 100644
--- a/src/window_park.c
+++ b/src/window_park.c
@@ -1167,8 +1167,11 @@ static void window_park_init_viewport(rct_window *w)
 				(viewportWidget->right - viewportWidget->left) - 2,
 				(viewportWidget->bottom - viewportWidget->top) - 2,
 				zr&0xFF,
-				zr,
-				xy
+				x,
+				y,
+				z,
+				xy&0xC0000000 >> 30, 
+				-1
 			);
 			w->flags |= (1 << 2);
 			window_invalidate(w);