diff --git a/include/budg.h b/include/budg.h
index f16cd865..0a5b452e 100644
--- a/include/budg.h
+++ b/include/budg.h
@@ -48,8 +48,7 @@ void bp_put_item(struct bp *, struct sctstr *, i_type, int);
 void bp_put_items(struct bp *, struct sctstr *);
 int bp_get_avail(struct bp *, struct sctstr *);
 void bp_put_avail(struct bp *, struct sctstr *, int);
-
-int get_materials(struct sctstr *, struct bp *, short[], int);
+void bp_to_sect(struct bp *, struct sctstr *);
 
 extern int money[MAXNOC];
 extern int pops[MAXNOC];
diff --git a/include/prototypes.h b/include/prototypes.h
index 950e25e3..fd3a20ac 100644
--- a/include/prototypes.h
+++ b/include/prototypes.h
@@ -672,7 +672,7 @@ extern int prod_land(int, int, struct bp *, int);
 /* main.c */
 /* in server.h */
 /* material.c */
-/* in budg.h */
+extern int get_materials(struct sctstr *, short[], int);
 /* mobility.c */
 extern void mob_sect(void);
 extern void mob_ship(void);
diff --git a/src/lib/update/bp.c b/src/lib/update/bp.c
index 0041c334..020cf1c2 100644
--- a/src/lib/update/bp.c
+++ b/src/lib/update/bp.c
@@ -132,6 +132,21 @@ bp_set_from_sect(struct bp *bp, struct sctstr *sp)
     bp_put_avail(bp, sp, sp->sct_avail);
 }
 
+/* Copy the values tracked in @bp for sector @sp back to @sp. */
+void
+bp_to_sect(struct bp *bp, struct sctstr *sp)
+{
+    i_type i;
+    enum bp_item_idx idx;
+
+    for (i = I_NONE + 1; i <= I_MAX; i++) {
+	idx = bud_key[i];
+	if (idx >= 0)
+	    sp->sct_item[i] = bp[sp->sct_uid].bp_item[idx];
+    }
+    sp->sct_avail = bp[sp->sct_uid].bp_avail;
+}
+
 /*
  * Return a new bp map.
  * Caller should pass it to free() when done with it.
diff --git a/src/lib/update/land.c b/src/lib/update/land.c
index 0d9bd9b1..5eb96500 100644
--- a/src/lib/update/land.c
+++ b/src/lib/update/land.c
@@ -196,7 +196,7 @@ landrepair(struct lndstr *land, struct natstr *np, struct bp *bp, int etus)
 {
     struct lchrstr *lp = &lchr[(int)land->lnd_type];
     int delta;
-    struct sctstr *sp;
+    struct sctstr *sp, scratch_sect;
     int build;
     int avail;
     int mult;
@@ -211,14 +211,17 @@ landrepair(struct lndstr *land, struct natstr *np, struct bp *bp, int etus)
     if (relations_with(sp->sct_own, land->lnd_own) != ALLIED)
 	return;
 
+    if (player->simulation) {
+	scratch_sect = *sp;
+	bp_to_sect(bp, &scratch_sect);
+	sp = &scratch_sect;
+    }
+
     mult = 1;
     if (np->nat_level[NAT_TLEV] < land->lnd_tech * 0.85)
 	mult = 2;
 
-    if (!player->simulation)
-	avail = sp->sct_avail * 100;
-    else
-	avail = bp_get_avail(bp, sp) * 100;
+    avail = sp->sct_avail * 100;
 
     delta = roundavg((double)avail / lp->l_bwork);
     if (delta <= 0)
@@ -228,7 +231,7 @@ landrepair(struct lndstr *land, struct natstr *np, struct bp *bp, int etus)
     if (delta > 100 - land->lnd_effic)
 	delta = 100 - land->lnd_effic;
 
-    build = get_materials(sp, bp, lp->l_mat, delta);
+    build = get_materials(sp, lp->l_mat, delta);
 
     if ((sp->sct_type != SCT_HEADQ) && (sp->sct_type != SCT_FORTR))
 	build /= 3;
@@ -236,13 +239,9 @@ landrepair(struct lndstr *land, struct natstr *np, struct bp *bp, int etus)
     avail -= build * lp->l_bwork;
     if (avail < 0)
 	avail = 0;
-    if (!player->simulation)
-	sp->sct_avail = avail / 100;
-    else
-	bp_put_avail(bp, sp, avail / 100);
+    sp->sct_avail = avail / 100;
 
-    if (build < 0)
-	logerror("land unit %d building %d ! \n", land->lnd_uid, build);
+    bp_set_from_sect(bp, sp);
     np->nat_money -= mult * lp->l_cost * build / 100.0;
     if (!player->simulation) {
 	land->lnd_effic += (signed char)build;
diff --git a/src/lib/update/material.c b/src/lib/update/material.c
index 4fa3f185..5781719c 100644
--- a/src/lib/update/material.c
+++ b/src/lib/update/material.c
@@ -33,14 +33,11 @@
 
 #include <config.h>
 
-#include "budg.h"
 #include "chance.h"
-#include "player.h"
 #include "update.h"
 
 /*
  * Get build materials from sector @sp.
- * @bp is the sector's build pointer.
  * Array @mvec[ITEM_MAX+1] defines the materials needed to build 100%.
  * @pct is the percentage to build.
  * Adjust build percentage downwards so that available materials
@@ -48,14 +45,14 @@
  * Return adjusted build percentage.
  */
 int
-get_materials(struct sctstr *sp, struct bp *bp, short mvec[], int pct)
+get_materials(struct sctstr *sp, short mvec[], int pct)
 {
     int i, amt;
 
     for (i = I_NONE + 1; i <= I_MAX; i++) {
 	if (mvec[i] == 0)
 	    continue;
-	amt = bp_get_item(bp, sp, i);
+	amt = sp->sct_item[i];
 	if (amt * 100 < mvec[i] * pct)
 	    pct = amt * 100 / mvec[i];
     }
@@ -63,13 +60,11 @@ get_materials(struct sctstr *sp, struct bp *bp, short mvec[], int pct)
     for (i = I_NONE + 1; i <= I_MAX; i++) {
 	if (mvec[i] == 0)
 	    continue;
-	amt = bp_get_item(bp, sp, i);
+	amt = sp->sct_item[i];
 	amt -= roundavg(mvec[i] * pct / 100.0);
 	if (CANT_HAPPEN(amt < 0))
 	    amt = 0;
-	bp_put_item(bp, sp, i, amt);
-	if (!player->simulation)
-	    sp->sct_item[i] = amt;
+	sp->sct_item[i] = amt;
     }
 
     return pct;
diff --git a/src/lib/update/plane.c b/src/lib/update/plane.c
index 713676df..4b1c867c 100644
--- a/src/lib/update/plane.c
+++ b/src/lib/update/plane.c
@@ -126,7 +126,7 @@ planerepair(struct plnstr *pp, struct natstr *np, struct bp *bp, int etus)
     struct plchrstr *pcp = &plchr[(int)pp->pln_type];
     int build;
     struct shpstr *carrier;
-    struct sctstr *sp;
+    struct sctstr *sp, scratch_sect;
     int delta;
     int mult;
     int avail;
@@ -155,14 +155,17 @@ planerepair(struct plnstr *pp, struct natstr *np, struct bp *bp, int etus)
 	    return;
     }
 
+    if (player->simulation) {
+	scratch_sect = *sp;
+	bp_to_sect(bp, &scratch_sect);
+	sp = &scratch_sect;
+    }
+
     mult = 1;
     if (np->nat_level[NAT_TLEV] < pp->pln_tech * 0.85)
 	mult = 2;
 
-    if (!player->simulation)
-	avail = sp->sct_avail * 100;
-    else
-	avail = bp_get_avail(bp, sp) * 100;
+    avail = sp->sct_avail * 100;
     if (carrier)
 	avail += etus * carrier->shp_item[I_MILIT] / 2;
 
@@ -174,7 +177,7 @@ planerepair(struct plnstr *pp, struct natstr *np, struct bp *bp, int etus)
     if (delta > 100 - pp->pln_effic)
 	delta = 100 - pp->pln_effic;
 
-    build = get_materials(sp, bp, pcp->pl_mat, delta);
+    build = get_materials(sp, pcp->pl_mat, delta);
 
     if (carrier)
 	build = delta;
@@ -184,17 +187,10 @@ planerepair(struct plnstr *pp, struct natstr *np, struct bp *bp, int etus)
      * I didn't use roundavg here, because I want to
      * penalize the player with a large number of planes.
      */
-    if (!player->simulation)
-	avail = (sp->sct_avail * 100 - used) / 100;
-    else
-	avail = (bp_get_avail(bp, sp) * 100 - used) / 100;
-
+    avail = (sp->sct_avail * 100 - used) / 100;
     if (avail < 0)
 	avail = 0;
-    if (!player->simulation)
-	sp->sct_avail = avail;
-    else
-	bp_put_avail(bp, sp, avail);
+    sp->sct_avail = avail;
 
     if (sp->sct_type != SCT_AIRPT)
 	build /= 3;
@@ -203,6 +199,7 @@ planerepair(struct plnstr *pp, struct natstr *np, struct bp *bp, int etus)
 	    build = 80 - pp->pln_effic;
     }
 
+    bp_set_from_sect(bp, sp);
     np->nat_money -= mult * build * pcp->pl_cost / 100.0;
 
     if (!player->simulation)
diff --git a/src/lib/update/ship.c b/src/lib/update/ship.c
index 27ee0e8f..bf280e51 100644
--- a/src/lib/update/ship.c
+++ b/src/lib/update/ship.c
@@ -243,7 +243,7 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 {
     struct mchrstr *mp = &mchr[(int)ship->shp_type];
     int delta;
-    struct sctstr *sp;
+    struct sctstr *sp, scratch_sect;
     int build;
     int wf;
     int avail;
@@ -260,6 +260,12 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 	&& relations_with(sp->sct_own, ship->shp_own) < FRIENDLY)
 	return;
 
+    if (player->simulation) {
+	scratch_sect = *sp;
+	bp_to_sect(bp, &scratch_sect);
+	sp = &scratch_sect;
+    }
+
     mult = 1;
     if (np->nat_level[NAT_TLEV] < ship->shp_tech * 0.85)
 	mult = 2;
@@ -273,10 +279,8 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
     if (sp->sct_type != SCT_HARBR) {
 	wf /= 3;
 	avail = wf;
-    } else if (!player->simulation)
+    } else
 	avail = wf + sp->sct_avail * 100;
-    else
-	avail = wf + bp_get_avail(bp, sp) * 100;
 
     delta = roundavg((double)avail / mp->m_bwork);
     if (delta <= 0)
@@ -286,7 +290,7 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
     if (delta > 100 - ship->shp_effic)
 	delta = 100 - ship->shp_effic;
 
-    build = get_materials(sp, bp, mp->m_mat, delta);
+    build = get_materials(sp, mp->m_mat, delta);
 
     if (sp->sct_type != SCT_HARBR)
 	build = delta;
@@ -297,16 +301,10 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 	 * I didn't use roundavg here, because I want to penalize
 	 * the player with a large number of ships.
 	 */
-	if (!player->simulation)
-	    avail = (sp->sct_avail * 100 + wf) / 100;
-	else
-	    avail = (bp_get_avail(bp, sp) * 100 + wf) / 100;
+	avail = (sp->sct_avail * 100 + wf) / 100;
 	if (avail < 0)
 	    avail = 0;
-	if (!player->simulation)
-	    sp->sct_avail = avail;
-	else
-	    bp_put_avail(bp, sp, avail);
+	sp->sct_avail = avail;
     }
     if (sp->sct_type != SCT_HARBR)
 	if ((build + ship->shp_effic) > 80) {
@@ -315,6 +313,7 @@ shiprepair(struct shpstr *ship, struct natstr *np, struct bp *bp, int etus)
 		build = 0;
 	}
 
+    bp_set_from_sect(bp, sp);
     np->nat_money -= mult * mp->m_cost * build / 100.0;
     if (!player->simulation)
 	ship->shp_effic += (signed char)build;