diff --git a/terminatorlib/util.py b/terminatorlib/util.py
index 4122fe17..254f78c4 100755
--- a/terminatorlib/util.py
+++ b/terminatorlib/util.py
@@ -190,28 +190,34 @@ def get_edge(allocation, direction):
     directional navigation"""
     if direction == 'left':
         edge = allocation.x
+        p1, p2 = allocation.y, allocation.y + allocation.height
     elif direction == 'up':
         edge = allocation.y
+        p1, p2 = allocation.x, allocation.x + allocation.width
     elif direction == 'right':
         edge = allocation.x + allocation.width
+        p1, p2 = allocation.y, allocation.y + allocation.height
     elif direction == 'down':
         edge = allocation.y + allocation.height
+        p1, p2 = allocation.x, allocation.x + allocation.width
     else:
         raise ValueError('unknown direction %s' % direction)
     
-    return(edge)
+    return(edge, p1, p2)
 
-def get_nav_possible(edge, allocation, direction):
+def get_nav_possible(edge, allocation, direction, p1, p2):
     """Check if the supplied allocation is in the right direction of the
     supplied edge"""
+    x1, x2 = allocation.x, allocation.x + allocation.width
+    y1, y2 = allocation.y, allocation.y + allocation.height
     if direction == 'left':
-        return((allocation.x + allocation.width) <= edge)
+        return(x2 <= edge and y1 <= p2 and y2 >= p1)
     elif direction == 'right':
-        return(allocation.x >= edge)
+        return(x1 >= edge and y1 <= p2 and y2 >= p1)
     elif direction == 'up':
-        return((allocation.y + allocation.height) <= edge)
+        return(y2 <= edge and x1 <= p2 and x2 >= p1)
     elif direction == 'down':
-        return(allocation.y >= edge)
+        return(y1 >= edge and x1 <= p2 and x2 >= p1)
     else:
         raise ValueError('Unknown direction: %s' % direction)
 
@@ -221,11 +227,11 @@ def get_nav_offset(edge, allocation, direction):
     if direction == 'left':
         return(edge - (allocation.x + allocation.width))
     elif direction == 'right':
-        return(edge + allocation.x)
+        return(allocation.x - edge)
     elif direction == 'up':
-        return(edge - (allocation.y - allocation.height))
+        return(edge - (allocation.y + allocation.height))
     elif direction == 'down':
-        return(edge + allocation.y)
+        return(allocation.y - edge)
     else:
         raise ValueError('Unknown direction: %s' % direction)
 
diff --git a/terminatorlib/window.py b/terminatorlib/window.py
index 9c35a0c5..fc153d62 100755
--- a/terminatorlib/window.py
+++ b/terminatorlib/window.py
@@ -811,12 +811,13 @@ class Window(Container, Gtk.Window):
             possibles = []
 
             # Get the co-ordinate of the appropriate edge for this direction
-            edge = util.get_edge(allocation, direction)
+            edge, p1, p2 = util.get_edge(allocation, direction)
             # Find all visible terminals which are, in their entirity, in the
-            # direction we want to move
+            # direction we want to move, and are at least partially spanning
+            # p1 to p2
             for term in layout:
                 rect = layout[term]
-                if util.get_nav_possible(edge, rect, direction):
+                if util.get_nav_possible(edge, rect, direction, p1, p2):
                     possibles.append(term)
 
             if len(possibles) == 0: