diff --git a/computer.cpp b/computer.cpp
index bbd849f5af250..4541dc72a4b93 100644
--- a/computer.cpp
+++ b/computer.cpp
@@ -441,7 +441,7 @@ void computer::activate_function(game *g, computer_action action)
     tmp_om = g->cur_om;
     g->cur_om = overmap(g, tmp_om.posx, tmp_om.posy, level);
     tinymap tmpmap(&g->itypes, &g->mapitems, &g->traps);
-    tmpmap.load(g, g->levx, g->levy);
+    tmpmap.load(g, g->levx, g->levy, false);
     tmpmap.translate(t_missile, t_hole);
     tmpmap.save(&tmp_om, g->turn, g->levx, g->levy);
    }
diff --git a/game.cpp b/game.cpp
index 5c24611dd2dc9..5a116e25c299b 100644
--- a/game.cpp
+++ b/game.cpp
@@ -540,7 +540,7 @@ bool game::do_turn()
   for (int i = 0; i < z.size(); i++) {
    if (z[i].spawnmapx != -1) {	// Static spawn, move them back there
     tinymap tmp(&itypes, &mapitems, &traps);
-    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy);
+    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy, false);
     tmp.add_spawn(&(z[i]));
     tmp.save(&cur_om, turn, z[i].spawnmapx, z[i].spawnmapy);
    } else {	// Absorb them back into a group
@@ -6388,7 +6388,7 @@ void game::vertical_move(int movez, bool force)
  //m.save(&cur_om, turn, levx, levy);
  cur_om = overmap(this, cur_om.posx, cur_om.posy, cur_om.posz + movez);
  map tmpmap(&itypes, &mapitems, &traps);
- tmpmap.load(this, levx, levy);
+ tmpmap.load(this, levx, levy, false);
  cur_om = overmap(this, cur_om.posx, cur_om.posy, original_z);
 // Find the corresponding staircase
  int stairx = -1, stairy = -1;
@@ -6447,12 +6447,12 @@ void game::vertical_move(int movez, bool force)
      coming_to_stairs.push_back( monster_and_count(z[i], 1 + turns) );
    } else if (z[i].spawnmapx != -1) { // Static spawn, move them back there
     tinymap tmp(&itypes, &mapitems, &traps);
-    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy);
+    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy, false);
     tmp.add_spawn(&(z[i]));
     tmp.save(&cur_om, turn, z[i].spawnmapx, z[i].spawnmapy);
    } else if (z[i].friendly < 0) { // Friendly, make it into a static spawn
     tinymap tmp(&itypes, &mapitems, &traps);
-    tmp.load(this, levx, levy);
+    tmp.load(this, levx, levy, false);
     int spawnx = z[i].posx, spawny = z[i].posy;
     while (spawnx < 0)
      spawnx += SEEX;
@@ -6593,7 +6593,7 @@ void game::update_map(int &x, int &y)
 // Despawn; we're out of bounds
    if (z[i].spawnmapx != -1) {	// Static spawn, move them back there
     map tmp(&itypes, &mapitems, &traps);
-    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy);
+    tmp.load(this, z[i].spawnmapx, z[i].spawnmapy, false);
     tmp.add_spawn(&(z[i]));
     tmp.save(&cur_om, turn, z[i].spawnmapx, z[i].spawnmapy);
    } else {	// Absorb them back into a group
@@ -7209,7 +7209,7 @@ void game::nuke(int x, int y)
   return;
  int mapx = x * 2, mapy = y * 2;
  map tmpmap(&itypes, &mapitems, &traps);
- tmpmap.load(this, mapx, mapy);
+ tmpmap.load(this, mapx, mapy, false);
  for (int i = 0; i < SEEX * 2; i++) {
   for (int j = 0; j < SEEY * 2; j++) {
    if (!one_in(10))
diff --git a/map.cpp b/map.cpp
index 9c33f0020e0ae..c132461c0c493 100644
--- a/map.cpp
+++ b/map.cpp
@@ -2184,12 +2184,12 @@ void map::save(overmap *om, unsigned int turn, int x, int y)
  }
 }
 
-void map::load(game *g, int wx, int wy)
+void map::load(game *g, int wx, int wy, bool update_vehicle)
 {
  for (int gridx = 0; gridx < my_MAPSIZE; gridx++) {
   for (int gridy = 0; gridy < my_MAPSIZE; gridy++) {
    if (!loadn(g, wx, wy, gridx, gridy))
-    loadn(g, wx, wy, gridx, gridy);
+    loadn(g, wx, wy, gridx, gridy, update_vehicle);
   }
  }
 }
@@ -2304,7 +2304,7 @@ void map::saven(overmap *om, unsigned int turn, int worldx, int worldy,
 // 0,0  1,0  2,0
 // 0,1  1,1  2,1
 // 0,2  1,2  2,2 etc
-bool map::loadn(game *g, int worldx, int worldy, int gridx, int gridy)
+bool map::loadn(game *g, int worldx, int worldy, int gridx, int gridy, bool update_vehicles)
 {
  int absx = g->cur_om.posx * OMAPX * 2 + worldx + gridx,
      absy = g->cur_om.posy * OMAPY * 2 + worldy + gridy,
@@ -2312,7 +2312,7 @@ bool map::loadn(game *g, int worldx, int worldy, int gridx, int gridy)
  submap *tmpsub = MAPBUFFER.lookup_submap(absx, absy, g->cur_om.posz);
  if (tmpsub) {
   grid[gridn] = tmpsub;
-  for (int i = 0; i < grid[gridn]->vehicles.size(); i++) {
+  for (int i = 0; update_vehicles && i < grid[gridn]->vehicles.size(); i++) {
    grid[gridn]->vehicles[i].smx = gridx;
    grid[gridn]->vehicles[i].smy = gridy;
   }
@@ -2339,9 +2339,8 @@ void map::copy_grid(int to, int from)
 {
  grid[to] = grid[from];
  for (int i = 0; i < grid[to]->vehicles.size(); i++) {
-  int ind = grid[to]->vehicles.size() - 1;
-  grid[to]->vehicles[ind].smx = to % my_MAPSIZE;
-  grid[to]->vehicles[ind].smy = to / my_MAPSIZE;
+  grid[to]->vehicles[i].smx = to % my_MAPSIZE;
+  grid[to]->vehicles[i].smy = to / my_MAPSIZE;
  }
 }
 
diff --git a/map.h b/map.h
index 0d27e08b174ca..b27b963922fe4 100644
--- a/map.h
+++ b/map.h
@@ -42,7 +42,7 @@ class map
 
 // File I/O
  virtual void save(overmap *om, unsigned int turn, int x, int y);
- virtual void load(game *g, int wx, int wy);
+ virtual void load(game *g, int wx, int wy, bool update_vehicles = true);
  void shift(game *g, int wx, int wy, int x, int y);
  void spawn_monsters(game *g);
  void clear_spawns();
@@ -158,7 +158,7 @@ class map
 
 protected:
  void saven(overmap *om, unsigned int turn, int x, int y, int gridx, int gridy);
- bool loadn(game *g, int x, int y, int gridx, int gridy);
+ bool loadn(game *g, int x, int y, int gridx, int gridy, bool update_vehicles = true);
  void copy_grid(int to, int from);
  void draw_map(oter_id terrain_type, oter_id t_north, oter_id t_east,
                oter_id t_south, oter_id t_west, oter_id t_above, int turn,
diff --git a/mission_start.cpp b/mission_start.cpp
index a24a136d636e7..8ad4a9fe5880d 100644
--- a/mission_start.cpp
+++ b/mission_start.cpp
@@ -47,7 +47,7 @@ void mission_start::place_dog(game *g, mission *miss)
  }
 
  tinymap doghouse(&(g->itypes), &(g->mapitems), &(g->traps));
- doghouse.load(g, house.x * 2, house.y * 2);
+ doghouse.load(g, house.x * 2, house.y * 2, false);
  doghouse.add_spawn(mon_dog, 1, SEEX, SEEY, true, -1, miss->uid);
  doghouse.save(&(g->cur_om), int(g->turn), house.x * 2, house.y * 2);
 }
@@ -65,7 +65,7 @@ void mission_start::place_zombie_mom(game *g, mission *miss)
  }
 
  tinymap zomhouse(&(g->itypes), &(g->mapitems), &(g->traps));
- zomhouse.load(g, house.x * 2, house.y * 2);
+ zomhouse.load(g, house.x * 2, house.y * 2, false);
  zomhouse.add_spawn(mon_zombie, 1, SEEX, SEEY, false, -1, miss->uid,
                     random_first_name(false));
  zomhouse.save(&(g->cur_om), int(g->turn), house.x * 2, house.y * 2);
@@ -113,7 +113,7 @@ void mission_start::place_npc_software(game *g, mission *miss)
    g->cur_om.seen(x, y) = true;
  }
  tinymap compmap(&(g->itypes), &(g->mapitems), &(g->traps));
- compmap.load(g, place.x * 2, place.y * 2);
+ compmap.load(g, place.x * 2, place.y * 2, false);
  point comppoint;
 
  switch (g->cur_om.ter(place.x, place.y)) {