diff --git a/src/water_cmd.cpp b/src/water_cmd.cpp
--- a/src/water_cmd.cpp
+++ b/src/water_cmd.cpp
@@ -1233,7 +1233,8 @@ void ConvertGroundTilesIntoWaterTiles()
 
 static TrackStatus GetTileTrackStatus_Water(TileIndex tile, TransportType mode, uint sub_mode, DiagDirection side)
 {
-	static const byte coast_tracks[] = {0, 32, 4, 0, 16, 0, 0, 0, 8, 0, 0, 0, 0, 0, 0, 0};
+	static const TrackBits coast_tracks[] = {TRACK_BIT_NONE, TRACK_BIT_RIGHT, TRACK_BIT_UPPER, TRACK_BIT_NONE, TRACK_BIT_LEFT, TRACK_BIT_NONE, TRACK_BIT_NONE,
+		TRACK_BIT_NONE, TRACK_BIT_LOWER, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE, TRACK_BIT_NONE};
 
 	TrackBits ts;
 
@@ -1241,7 +1242,7 @@ static TrackStatus GetTileTrackStatus_Wa
 
 	switch (GetWaterTileType(tile)) {
 		case WATER_TILE_CLEAR: ts = IsTileFlat(tile) ? TRACK_BIT_ALL : TRACK_BIT_NONE; break;
-		case WATER_TILE_COAST: ts = (TrackBits)coast_tracks[GetTileSlope(tile) & 0xF]; break;
+		case WATER_TILE_COAST: ts = coast_tracks[GetTileSlope(tile) & 0xF]; break;
 		case WATER_TILE_LOCK:  ts = DiagDirToDiagTrackBits(GetLockDirection(tile)); break;
 		case WATER_TILE_DEPOT: ts = AxisToTrackBits(GetShipDepotAxis(tile)); break;
 		default: return 0;