How should I fix this code to work in playmode local head = char.Head "Minimap"?

Hi I am making a game which needs a minimap. But it is not working because roblox developers console is saying Head is not a valid member of model. The script for the minimap works fine in Roblox Studio but it doesn't work in playmode. The error is in line 7.

local maptransparency = .1   -- set to a number between 1 and 0     Controls how transparent the map looks
local mapsize = 200 -- the size in pixels of your minimap 
local lagfactor = 10  -- I recommend 4   --- set this from 1-10, with 1 being the most detailed and the most laggy, and ten being the worst detail but least laggy (it can be set to more than ten, but I don't advise it)

local player = game.Players.LocalPlayer
local char = player.Character or player.CharacterAdded:Wait()
local head = char.Head
local todestroy = {}


script.Parent.speck.Size = UDim2.new(0,lagfactor,0,lagfactor)
script.Parent.Size = UDim2.new(0,mapsize,0,mapsize)
script.Parent.you.Position = UDim2.new(0, (mapsize/2 - 5), 0, (mapsize/2 -5))

function Color(p)
	return Color3.new( (p.BrickColor.r),(p.BrickColor.g),(p.BrickColor.b))
end

function visible()
	
	for _, thing in pairs (script.Parent:GetChildren()) do
		if thing.ClassName ~= "LocalScript" then
			thing.Visible = true
		end
	end
	script.Parent.speck.Visible = false
	
end

function go()
	todestroy = {}
	local pos = head.Position + Vector3.new(0,1000,0)
	local a
	if lagfactor <= 2 then
		a = false
	end
	local x = (-.5 * mapsize)
	local z = (-.5 * mapsize)
	repeat 
		x = (-.5 * mapsize)	
		if a ~= nil then
			a = not a
			if a == false then
				wait()
			end
		else
			wait()
		end
		repeat 
			local newpos = pos + Vector3.new(x,0,z)
			local ray = Ray.new(newpos, ( (newpos - Vector3.new(0,1000,0) ) - newpos).unit * 3000)
			local part,p = workspace:FindPartOnRay(ray)
			local oldspeck = script.Parent:FindFirstChild(x .. z)
			if oldspeck ~= nil then 
				todestroy[#todestroy+1] = oldspeck
			end
			if part ~= nil then
				if part:IsA("BasePart") then
					local speck = script.Parent.speck:Clone()
					speck.BackgroundColor3 = Color(part)
					speck.Position = UDim2.new(0,x + ((.5 * mapsize)),0,z + ((.5 * mapsize)))
					speck.Name = x .. z
					speck.Parent = script.Parent
					
					
				end
			end
			x = x + lagfactor
			
		until x >= (.5 * mapsize)
		z = z + lagfactor
		
	until z >= (.5 * mapsize)
end

function deleteold()
	
	for i = 1, # todestroy do
		todestroy[i]:Destroy()
	end
	
end

while true do
	go()
	--
	visible()
	--
	deleteold()
end