diff --git a/sw/ground_segment/cockpit/map2d.ml b/sw/ground_segment/cockpit/map2d.ml
index f117235e88..4d1b3387b3 100644
--- a/sw/ground_segment/cockpit/map2d.ml
+++ b/sw/ground_segment/cockpit/map2d.ml
@@ -448,20 +448,22 @@ let active_gm_auto = fun x ->
   gm_auto := x
 
 let button_press = fun (geomap:MapCanvas.widget) ev ->
-  if GdkEvent.Button.button ev = 3 then
+  if GdkEvent.Button.button ev = 3 then begin
     let xc = GdkEvent.Button.x ev 
     and yc = GdkEvent.Button.y ev in
     let (xw,yw) = geomap#window_to_world xc yc in
     
     let wgs84 = geomap#of_world (xw,yw) in
-    let (xw',yw') = geomap#world_of wgs84 in
-    ignore(Thread.create (fun geo ->
-      try ignore (MapGoogle.display_tile geomap geo) with
-	Gm.Not_available -> ())
-      wgs84);
-    false
-  else
-    false
+    let display = fun geo ->
+      if Gdk.Convert.test_modifier `SHIFT (GdkEvent.Button.state ev) then
+	MapIGN.display_tile geomap geo
+      else
+	try ignore (MapGoogle.display_tile geomap geo) with
+	  Gm.Not_available -> () in
+
+    ignore(Thread.create display wgs84)
+  end;
+  false
 
 
 let fill_gm_tiles = fun geomap -> ignore (Thread.create MapGoogle.fill_window geomap)
@@ -480,6 +482,8 @@ let _ =
     [ "-b", Arg.String (fun x -> ivy_bus := x), "Bus\tDefault is 127.255.255.25:2010";
       "-ref", Arg.Set_string geo_ref, "Geographic ref (default '')";
       "-mercator", Arg.Unit (fun () -> projection:=MapCanvas.Mercator),"Switch to (Google Maps) Mercator projection";
+      "-lambertIIe", Arg.Unit (fun () -> projection:=MapCanvas.LambertIIe),"Switch to LambertIIe projection";
+      "-ign", Arg.Set_string IGN.data_path, "IGN tiles path";
       "-m", Arg.String (fun x -> map_file := x), "Map description file"] in
   Arg.parse (options)
     (fun x -> Printf.fprintf stderr "Warning: Don't do anythig with %s\n" x)
diff --git a/sw/lib/ocaml/Makefile b/sw/lib/ocaml/Makefile
index d4993c015f..d1bf61bb8b 100644
--- a/sw/lib/ocaml/Makefile
+++ b/sw/lib/ocaml/Makefile
@@ -26,11 +26,11 @@ OCAMLC=ocamlc $(INCLUDES)
 OCAMLOPT=ocamlopt $(INCLUDES)
 
 
-SRC = debug.ml env.ml serial.ml ocaml_tools.ml extXml.ml xml2h.ml latlong.ml srtm.ml http.ml gm.ml wavecard.ml geometry_2d.ml geometry_3d.ml cserial.o convert.o ubx.ml pprz.ml
+SRC = debug.ml env.ml serial.ml ocaml_tools.ml extXml.ml xml2h.ml latlong.ml srtm.ml http.ml gm.ml iGN.ml wavecard.ml geometry_2d.ml geometry_3d.ml cserial.o convert.o ubx.ml pprz.ml
 CMO = $(SRC:.ml=.cmo)
 CMX = $(SRC:.ml=.cmx)
 
-XSRC = platform.ml gtkgl_Hack.ml ml_gtkgl_hack.o gtk_image.ml gtk_tools_icons.ml gtk_tools.ml gtk_draw.ml gtk_tools_GL.ml gtk_3d.ml mapCanvas.ml mapWaypoints.ml mapTrack.ml mapGoogle.ml ml_gtk_drag.o xmlEdit.ml
+XSRC = platform.ml gtkgl_Hack.ml ml_gtkgl_hack.o gtk_image.ml gtk_tools_icons.ml gtk_tools.ml gtk_draw.ml gtk_tools_GL.ml gtk_3d.ml mapCanvas.ml mapWaypoints.ml mapTrack.ml mapGoogle.ml mapIGN.ml ml_gtk_drag.o xmlEdit.ml
 XCMO = $(XSRC:.ml=.cmo)
 XCMX = $(XSRC:.ml=.cmx)
 
diff --git a/sw/lib/ocaml/iGN.ml b/sw/lib/ocaml/iGN.ml
new file mode 100644
index 0000000000..9e87c1d8ac
--- /dev/null
+++ b/sw/lib/ocaml/iGN.ml
@@ -0,0 +1,69 @@
+(*
+ * $Id$
+ *
+ * Handling IGN tiles
+ *  
+ * Copyright (C) 2004-2006 ENAC, Pascal Brisset, Antoine Drouin
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA. 
+ *
+ *)
+
+let (//) = Filename.concat
+
+module LL = Latlong
+
+type tile_t = {
+    key : int * int; (* LambertIIe meters / size_m *)
+    sw_corner : Latlong.geographic;
+    ne_corner : Latlong.geographic
+  };;
+
+let size_px = 250
+let size_m = (size_px * 25) / 10
+
+let tile_size = size_px , size_px
+
+let data_path = ref "/path_to_ign_files"
+
+let tile_of_geo = fun wgs84 ->
+  let lbt = LL.lambertIIe_of wgs84 in
+  let kx = lbt.LL.lbt_x / size_m
+  and ky = lbt.LL.lbt_y / size_m in
+  let x0 = kx * size_m and y0 = ky * size_m in
+  let x1 = x0 + size_m and y1 = y0 + size_m in
+  let sw_corner= LL.of_lambertIIe {LL.lbt_x=x0; lbt_y=y0}
+  and ne_corner =  LL.of_lambertIIe {LL.lbt_x=x1; lbt_y=y1} in
+  { key = (kx, ky);
+    sw_corner = sw_corner;
+    ne_corner = ne_corner }
+    
+let get_tile = fun tile ->
+  let (kx, ky) = tile.key in
+  let dalle_x = (kx * size_m) / 10000
+  and dalle_y = 267 - ((ky*size_m) / 10000) in
+  let file = !data_path // Printf.sprintf "F%03d_%03d.png" dalle_x dalle_y in
+  let tmp_file = Filename.temp_file "ign" ".png" in
+  let ix = (kx mod (10000 / size_m)) * size_px
+  and iy = 4000 - size_px - ((ky mod (10000 / size_m)) * size_px) in
+  let sub_tile = Printf.sprintf "convert -crop %dx%d+%d+%d %s %s" size_px size_px ix iy file tmp_file in
+  let x = Sys.command sub_tile in
+  if x <> 0 then failwith sub_tile;
+  tmp_file
+  
+  
diff --git a/sw/lib/ocaml/iGN.mli b/sw/lib/ocaml/iGN.mli
new file mode 100644
index 0000000000..09abe3a538
--- /dev/null
+++ b/sw/lib/ocaml/iGN.mli
@@ -0,0 +1,41 @@
+(*
+ * $Id$
+ *
+ * Handling IGN tiles
+ *  
+ * Copyright (C) 2004-2006 ENAC, Pascal Brisset, Antoine Drouin
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA. 
+ *
+ *)
+
+val tile_size : int * int (** Pixels *)
+
+type tile_t = {
+    key : int * int; (* LambertIIe meters / size *)
+    sw_corner : Latlong.geographic;
+    ne_corner : Latlong.geographic
+  };;
+
+val data_path : string ref
+(** Where to find the original tiles *)
+
+val tile_of_geo : Latlong.geographic -> tile_t
+
+val get_tile : tile_t -> string
+(** Returns the filename of the given tile *)
diff --git a/sw/lib/ocaml/latlong.ml b/sw/lib/ocaml/latlong.ml
index f2c854e7c3..07c156e8b9 100644
--- a/sw/lib/ocaml/latlong.ml
+++ b/sw/lib/ocaml/latlong.ml
@@ -352,7 +352,7 @@ let lambertIIe_of = fun wgs84 ->
 let lbt_add = fun {lbt_x=x; lbt_y=y} (dx, dy) ->
   {lbt_x = x + truncate dx; lbt_y = y + truncate dy }
 let lbt_sub = fun {lbt_x=x1; lbt_y=y1} {lbt_x=x2; lbt_y=y2} ->
-  (float (x2-x1), float (y2-y1))
+  (float (x1-x2), float (y1-y2))
 
 let space = Str.regexp "[ \t]+"
 let fos = float_of_string
diff --git a/sw/lib/ocaml/mapGoogle.ml b/sw/lib/ocaml/mapGoogle.ml
index b7338b29a1..af53f3c913 100644
--- a/sw/lib/ocaml/mapGoogle.ml
+++ b/sw/lib/ocaml/mapGoogle.ml
@@ -81,7 +81,8 @@ let display_the_tile = fun geomap tile jpg_file ->
   and east_long = west_long +. tile.Gm.width in
   let ne = { LL.posn_lat = north_lat; posn_long = east_long } in
   
-  let map = geomap#display_pixbuf ((0,256), tile.Gm.sw_corner) ((256,0),ne) (GdkPixbuf.from_file jpg_file) in
+  let (tx, ty) = Gm.tile_size in
+  let map = geomap#display_pixbuf ((0,tx), tile.Gm.sw_corner) ((ty,0),ne) (GdkPixbuf.from_file jpg_file) in
   map#raise 1;
   add_tile tile.Gm.key
     
diff --git a/sw/lib/ocaml/mapIGN.ml b/sw/lib/ocaml/mapIGN.ml
new file mode 100644
index 0000000000..f868e5c324
--- /dev/null
+++ b/sw/lib/ocaml/mapIGN.ml
@@ -0,0 +1,43 @@
+(*
+ * $Id$
+ *
+ * Displaying IGN Maps on a MapCanvas object
+ *  
+ * Copyright (C) 2004-2006 ENAC, Pascal Brisset, Antoine Drouin
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA. 
+ *
+ *)
+
+module LL = Latlong
+
+let displayed_tiles = Hashtbl.create 41
+let mem_tile = fun t -> Hashtbl.mem displayed_tiles t.IGN.key
+let add_tile = fun t -> Hashtbl.add displayed_tiles t.IGN.key ()
+
+(** Displaying the tile around the given point *)
+let display_tile = fun (geomap:MapCanvas.widget) wgs84 ->
+  let tile = IGN.tile_of_geo wgs84 in
+
+  if not (mem_tile tile) then
+    let jpg_file = IGN.get_tile tile in
+    
+    let (sx,sy) = IGN.tile_size in
+    let map = geomap#display_pixbuf ((0,sx), tile.IGN.sw_corner) ((sy,0),tile.IGN.ne_corner) (GdkPixbuf.from_file jpg_file) in
+    map#raise 1;
+    add_tile tile
diff --git a/sw/lib/ocaml/mapIGN.mli b/sw/lib/ocaml/mapIGN.mli
new file mode 100644
index 0000000000..e6fc88fe97
--- /dev/null
+++ b/sw/lib/ocaml/mapIGN.mli
@@ -0,0 +1,27 @@
+(*
+ * $Id$
+ *
+ * Displaying IGN Maps on a MapCanvas object
+ *  
+ * Copyright (C) 2004-2006 ENAC, Pascal Brisset, Antoine Drouin
+ *
+ * This file is part of paparazzi.
+ *
+ * paparazzi is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * paparazzi is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with paparazzi; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA. 
+ *
+ *)
+
+val display_tile : MapCanvas.widget -> Latlong.geographic -> unit