X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=gps%2Fsrc%2Forg%2Fwamblee%2Fgps%2Fgeometry%2FCoordinateSystem.java;h=98fee484ee63b741d5ce543ff593610bb85e950c;hb=9584bb45a4731bbfccd810b586441d54ea660871;hp=9094336bf0a2bce1dfd1757c1ddcd6d903c80ccc;hpb=b08709beca30891d29b3608a0de36699f2537744;p=utils

diff --git a/gps/src/org/wamblee/gps/geometry/CoordinateSystem.java b/gps/src/org/wamblee/gps/geometry/CoordinateSystem.java
index 9094336b..98fee484 100644
--- a/gps/src/org/wamblee/gps/geometry/CoordinateSystem.java
+++ b/gps/src/org/wamblee/gps/geometry/CoordinateSystem.java
@@ -16,11 +16,13 @@
 
 package org.wamblee.gps.geometry;
 
+import java.io.Serializable;
+
 
 /**
  * Represents a coordinate system. 
  */
-public interface CoordinateSystem {
+public interface CoordinateSystem extends Serializable {
     
     /**
      * Conversion to a reference coordinate system.