diff --git a/include/prototypes.h b/include/prototypes.h
index 5e9bbf9b..6089b6da 100644
--- a/include/prototypes.h
+++ b/include/prototypes.h
@@ -685,6 +685,7 @@ extern s_char *shp_path(int, struct shpstr *, s_char *);
 extern void shp_put(struct emp_qelem *, natid);
 extern void shp_list(struct emp_qelem *);
 extern int shp_check_nav(struct sctstr *);
+extern int sect_has_dock(struct sctstr *);
 extern int shp_hardtarget(struct shpstr *);
 extern void shp_view(struct emp_qelem *);
 extern int shp_nav_one_sector(struct emp_qelem *, int, natid, int);
diff --git a/src/lib/commands/fuel.c b/src/lib/commands/fuel.c
index 9e64d66b..197c1632 100644
--- a/src/lib/commands/fuel.c
+++ b/src/lib/commands/fuel.c
@@ -134,8 +134,7 @@ fuel(void)
 	    mp = &mchr[(int)item.ship.shp_type];
 
 	    harbor = 0;
-	    if (sect.sct_type == SCT_HARBR
-		|| IS_BIG_CITY(sect.sct_type)) {
+	    if (sect_has_dock(&sect)) {
 		harbor = 1;
 		oil_amt = sect.sct_item[I_OIL];
 		pet_amt = sect.sct_item[I_PETROL];
diff --git a/src/lib/commands/load.c b/src/lib/commands/load.c
index c39a6830..0ffdd8a7 100644
--- a/src/lib/commands/load.c
+++ b/src/lib/commands/load.c
@@ -139,8 +139,7 @@ load(void)
 	    (ship.shp_own != player->cnum))
 	    continue;
 	if (!player->owner &&
-	    sect.sct_type != SCT_HARBR &&
-	    !IS_BIG_CITY(sect.sct_type))
+	    !sect_has_dock(&sect))
 	    continue;
 	if (!sect.sct_own)
 	    continue;
@@ -150,8 +149,7 @@ load(void)
 		   xyas(ship.shp_x, ship.shp_y, player->cnum));
 	    continue;
 	}
-	if (sect.sct_type != SCT_HARBR &&
-	    !IS_BIG_CITY(sect.sct_type)) {
+	if (!sect_has_dock(&sect)) {
 	    if (noisy)
 		pr("Sector %s is not a harbor%s%s.\n",
 		   xyas(ship.shp_x, ship.shp_y, player->cnum),
diff --git a/src/lib/subs/shpsub.c b/src/lib/subs/shpsub.c
index f853e3ba..5a9a63e2 100644
--- a/src/lib/subs/shpsub.c
+++ b/src/lib/subs/shpsub.c
@@ -388,6 +388,17 @@ shp_check_nav(struct sctstr *sect)
     return CN_NAVIGABLE;
 }
 
+int
+sect_has_dock(struct sctstr *sect)
+{
+    switch (dchr[sect->sct_type].d_nav) {
+    case NAV_02:
+	return 1;
+    default:
+	return 0;
+    }
+}
+
 static int
 shp_count(struct emp_qelem *list, int wantflags, int nowantflags, int x,
 	  int y)
diff --git a/src/lib/update/nav_ship.c b/src/lib/update/nav_ship.c
index 1c9edfff..bb5897ad 100644
--- a/src/lib/update/nav_ship.c
+++ b/src/lib/update/nav_ship.c
@@ -193,8 +193,7 @@ nav_loadship(struct shpstr *sp, natid cnum)
 	    didsomething[i] = 1;
 	    continue;
 	}
-	if (sectp->sct_type != SCT_HARBR &&
-	    !IS_BIG_CITY(sectp->sct_type)) {
+	if (!sect_has_dock(sectp)) {
 	    /* we can only load in harbors */
 	    didsomething[i] = 1;
 	    continue;