Index: src/uk/me/parabola/imgfmt/app/net/RouteNode.java
===================================================================
--- src/uk/me/parabola/imgfmt/app/net/RouteNode.java	(revision 4189)
+++ src/uk/me/parabola/imgfmt/app/net/RouteNode.java	(working copy)
@@ -202,7 +202,7 @@
 		if (haveLargeOffsets()) {
 			writer.put4((latOff << 16) | (lonOff & 0xffff));
 		} else {
-			writer.put3s((latOff << 12) | (lonOff & 0xfff));
+			writer.put3u((latOff << 12) | (lonOff & 0xfff));
 		}
 
 		if (!arcs.isEmpty()) {