diff --git a/src/saveload/map_sl.cpp b/src/saveload/map_sl.cpp
--- a/src/saveload/map_sl.cpp
+++ b/src/saveload/map_sl.cpp
@@ -53,7 +53,7 @@ static void Load_MAPT()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].type = buf[j];
 	}
 }
@@ -66,7 +66,7 @@ static void Save_MAPT()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].type;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -76,7 +76,7 @@ static void Load_MAPH()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].height = buf[j];
 	}
 }
@@ -89,7 +89,7 @@ static void Save_MAPH()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].height;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -99,7 +99,7 @@ static void Load_MAP1()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].m1 = buf[j];
 	}
 }
@@ -112,7 +112,7 @@ static void Save_MAP1()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].m1;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -122,7 +122,7 @@ static void Load_MAP2()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE,
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE,
 			/* In those versions the m2 was 8 bits */
 			IsSavegameVersionBefore(SLV_5) ? SLE_FILE_U8 | SLE_VAR_U16 : SLE_UINT16
 		);
@@ -138,7 +138,7 @@ static void Save_MAP2()
 	SlSetLength(size * sizeof(uint16));
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].m2;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
 	}
 }
 
@@ -148,7 +148,7 @@ static void Load_MAP3()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].m3 = buf[j];
 	}
 }
@@ -161,7 +161,7 @@ static void Save_MAP3()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].m3;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -171,7 +171,7 @@ static void Load_MAP4()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].m4 = buf[j];
 	}
 }
@@ -184,7 +184,7 @@ static void Save_MAP4()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].m4;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -194,7 +194,7 @@ static void Load_MAP5()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _m[i++].m5 = buf[j];
 	}
 }
@@ -207,7 +207,7 @@ static void Save_MAP5()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _m[i++].m5;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -219,7 +219,7 @@ static void Load_MAP6()
 	if (IsSavegameVersionBefore(SLV_42)) {
 		for (TileIndex i = 0; i != size;) {
 			/* 1024, otherwise we overflow on 64x64 maps! */
-			SlArray(buf.data(), 1024, SLE_UINT8);
+			SlCopy(buf.data(), 1024, SLE_UINT8);
 			for (uint j = 0; j != 1024; j++) {
 				_me[i++].m6 = GB(buf[j], 0, 2);
 				_me[i++].m6 = GB(buf[j], 2, 2);
@@ -229,7 +229,7 @@ static void Load_MAP6()
 		}
 	} else {
 		for (TileIndex i = 0; i != size;) {
-			SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+			SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 			for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _me[i++].m6 = buf[j];
 		}
 	}
@@ -243,7 +243,7 @@ static void Save_MAP6()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _me[i++].m6;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -253,7 +253,7 @@ static void Load_MAP7()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _me[i++].m7 = buf[j];
 	}
 }
@@ -266,7 +266,7 @@ static void Save_MAP7()
 	SlSetLength(size);
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _me[i++].m7;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT8);
 	}
 }
 
@@ -276,7 +276,7 @@ static void Load_MAP8()
 	TileIndex size = MapSize();
 
 	for (TileIndex i = 0; i != size;) {
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) _me[i++].m8 = buf[j];
 	}
 }
@@ -289,7 +289,7 @@ static void Save_MAP8()
 	SlSetLength(size * sizeof(uint16));
 	for (TileIndex i = 0; i != size;) {
 		for (uint j = 0; j != MAP_SL_BUF_SIZE; j++) buf[j] = _me[i++].m8;
-		SlArray(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
+		SlCopy(buf.data(), MAP_SL_BUF_SIZE, SLE_UINT16);
 	}
 }