diff --git a/ubb-la/gui.c b/ubb-la/gui.c
index 0c0f3f7..9b235a6 100644
--- a/ubb-la/gui.c
+++ b/ubb-la/gui.c
@@ -159,13 +159,14 @@ static void show_buffer(const uint8_t *buf, int skip, int nibbles,
     int x0, int x1, int zoom, int pos)
 {
 	int xm, w, p0, p1;
-	int d;
+	int d, dp;
 
 	xm = (x0+x1) >> 1;
+	dp = pos-((nibbles+skip) >> 1);
 	if (zoom < 0) {
 		w = (nibbles-skip) >> -zoom;
-		p0 = xm-(w >> 1);
-		p1 = xm+((w+1) >> 1);
+		p0 = xm-(w >> 1)-(dp >> -zoom);
+		p1 = xm+((w+1) >> 1)-(dp >> -zoom);
 		if (p0 < x0) {
 			skip += (x0-p0) << -zoom;
 			p0 = x0;
@@ -177,8 +178,8 @@ static void show_buffer(const uint8_t *buf, int skip, int nibbles,
 		show_buffer_zoom_out(buf, skip, nibbles, p0, p1);
 	} else {
 		w = (nibbles-skip) << zoom;
-		p0 = xm-(w >> 1);
-		p1 = xm+((w+1) >> 1);
+		p0 = xm-(w >> 1)-(dp << zoom);
+		p1 = xm+((w+1) >> 1)-(dp << zoom);
 		if (p0 < x0) {
 			d = ((x0-p0)+(1 << zoom)-1) >> zoom;
 			skip += d;
@@ -229,6 +230,14 @@ void gui(const uint8_t *buf, int skip, int nibbles)
 					if (zoom > min_zoom)
 						zoom--;
 					break;
+				case SDLK_LEFT:
+					if (pos)
+						pos--;
+					break;
+				case SDLK_RIGHT:
+					if (pos < nibbles-1)
+						pos++;
+					break;
 				case SDLK_RETURN:
 				case SDLK_q:
 					return;