diff -r 492ca84ecc6c -r 1b6f956d8ac5 ship_gui.c
--- a/ship_gui.c	Mon Jan 10 14:43:00 2005 +0000
+++ b/ship_gui.c	Mon Jan 10 14:56:26 2005 +0000
@@ -684,7 +684,7 @@
 
 	xt = x / 90;
 	xm = x % 90;
-	if (xt >= 5)
+	if (xt >= w->hscroll.cap)
 		return 1;
 
 	row = (y - 14) / 24;
@@ -692,7 +692,7 @@
 	if (row >= w->vscroll.cap)
 		return 1;
 
-	pos = (row + w->vscroll.pos) * 3 + xt;
+	pos = (row + w->vscroll.pos) * w->hscroll.cap + xt;
 
 	tile = w->window_number;
 	FOR_ALL_VEHICLES(v) {