diff --git a/index.html b/index.html
index 38d68cc..e5f6735 100644
--- a/index.html
+++ b/index.html
@@ -31,7 +31,7 @@
     <form>
       Latitude: <input type="number" id="i_lat" size="10">&nbsp;&nbsp;&nbsp;&nbsp;
       Longitude: <input type="number" id="i_lon" size="10">&nbsp;&nbsp;&nbsp;&nbsp;
-      Grid-Square:  <input type="number" id="i_grid" size="4">&nbsp;&nbsp;&nbsp;&nbsp;
+      Grid-Square:  <input type="text" id="i_grid" size="4">&nbsp;&nbsp;&nbsp;&nbsp;
       <button onclick="forcePosition(); return false;">Move Map</button>
     </form>
     <script type="text/javascript">