diff --git a/HNS/Excercises/ShipCraft/main.py b/HNS/Excercises/ShipCraft/main.py
index b05d62f..fc7e8f1 100644
--- a/HNS/Excercises/ShipCraft/main.py
+++ b/HNS/Excercises/ShipCraft/main.py
@@ -34,7 +34,7 @@ class ShootResult(Enum):
     UNDEFINED = "UNDEFINED"
 
 
-def set_ship(row, col, ship_size, direction):
+def set_ship(field, row, col, ship_size, direction):
     if row < 0 or row > field_size:
         return
     if col < 0 or col > field_size:
@@ -45,13 +45,13 @@ def set_ship(row, col, ship_size, direction):
             return
         for r in range(row, row + ship_size):
             index = r * field_size + col
-            my_field[index] = "1"
+            field[index] = "1"
     if direction == 1:
         if field_size - col < ship_size:
             return
         for c in range(col, col + ship_size):
             index = row * field_size + c
-            my_field[index] = "1"
+            field[index] = "1"
 
 
 def shoot(field, row, col):
@@ -113,7 +113,7 @@ def keypress_handler(e):
 def left_button_click(field, row, col):
     if field_mode == 0:
         if check_possible(field, row, col):
-            set_ship(row, col, ship_size, ship_direction)
+            set_ship(field, row, col, ship_size, ship_direction)
     elif field_mode == 1:
         shoot(field, row, col)
     colorize(field, buttons)
@@ -185,9 +185,9 @@ window = Tk()
 window.title("Ship Craft!")
 window.geometry('450x410')
 window.bind_all('<KeyPress>', keypress_handler)
-set_ship(1, 1, 4, 1)
-set_ship(0, 6, 3, 0)
-set_ship(7, 3, 1, 0)
+set_ship(my_field, 1, 1, 4, 1)
+set_ship(my_field,0, 6, 3, 0)
+set_ship(my_field, 7, 3, 1, 0)
 draw_field(window, my_field)
 window.mainloop()