diff --git a/sys/apis/pathfind.lua b/sys/apis/pathfind.lua
index ce0fa69..ffb5d25 100644
--- a/sys/apis/pathfind.lua
+++ b/sys/apis/pathfind.lua
@@ -173,8 +173,8 @@ local function pathTo(dest, options)
 
 				-- use single turn method so the turtle doesn't turn around
 				-- when encountering obstacles
-				-- if not turtle.gotoSingleTurn(pt.x, pt.y, pt.z, pt.heading) then
-				if not turtle.goto(pt) then
+				if not turtle.gotoSingleTurn(pt.x, pt.y, pt.z, pt.heading) then
+				--if not turtle.goto(pt) then
 					local bpt = Point.nearestTo(turtle.point, pt)
 
 					table.insert(blocks, bpt)
diff --git a/sys/apis/ui/glasses.lua b/sys/apis/ui/glasses.lua
deleted file mode 100644
index cd8a26f..0000000
--- a/sys/apis/ui/glasses.lua
+++ /dev/null
@@ -1,196 +0,0 @@
-local class = require('class')
-local UI = require('ui')
-local Event = require('event')
-local Peripheral = require('peripheral')
-
---[[-- Glasses device --]]--
-local Glasses = class()
-function Glasses:init(args)
-
-	local defaults = {
-		backgroundColor = colors.black,
-		textColor = colors.white,
-		textScale = .5,
-		backgroundOpacity = .5,
-		multiplier = 2.6665,
---    multiplier = 2.333,
-	}
-	defaults.width, defaults.height = term.getSize()
-
-	UI:setProperties(defaults, args)
-	UI:setProperties(self, defaults)
-
-	self.bridge = Peripheral.get({
-		type = 'openperipheral_bridge',
-		method = 'addBox',
-	})
-	self.bridge.clear()
-
-	self.setBackgroundColor = function(...) end
-	self.setTextColor = function(...) end
-
-	self.t = { }
-	for i = 1, self.height do
-		self.t[i] = {
-			text = string.rep(' ', self.width+1),
-			--text = self.bridge.addText(0, 40+i*4, string.rep(' ', self.width+1), 0xffffff),
-			bg = { },
-			textFields = { },
-		}
-	end
-end
-
-function Glasses:setBackgroundBox(boxes, ax, bx, y, bgColor)
-	local colors = {
-		[ colors.black ] = 0x000000,
-		[ colors.brown ] = 0x7F664C,
-		[ colors.blue  ] = 0x253192,
-		[ colors.red   ] = 0xFF0000,
-		[ colors.gray  ] = 0x272727,
-		[ colors.lime  ] = 0x426A0D,
-		[ colors.green ] = 0x2D5628,
-		[ colors.white ] = 0xFFFFFF
-	}
-
-	local function overlap(box, ax, bx)
-		if bx < box.ax or ax > box.bx then
-			return false
-		end
-		return true
-	end
-
-	for _,box in pairs(boxes) do
-		if overlap(box, ax, bx) then 
-			if box.bgColor == bgColor then
-				ax = math.min(ax, box.ax)
-				bx = math.max(bx, box.bx)
-				box.ax = box.bx + 1
-			elseif ax == box.ax then
-				box.ax = bx + 1
-			elseif ax > box.ax then
-				if bx < box.bx then
-					table.insert(boxes, { -- split
-						ax = bx + 1,
-						bx = box.bx,
-						bgColor = box.bgColor
-					})
-					box.bx = ax - 1
-					break
-				else
-					box.ax = box.bx + 1
-				end
-			elseif ax < box.ax then
-				if bx > box.bx then
-					box.ax = box.bx + 1 -- delete
-				else
-					box.ax = bx + 1
-				end
-			end
-		end
-	end
-	if bgColor ~= colors.black then
-		table.insert(boxes, {
-			ax = ax,
-			bx = bx,
-			bgColor = bgColor
-		})
-	end
-
-	local deleted
-	repeat
-		deleted = false
-		for k,box in pairs(boxes) do
-			if box.ax > box.bx then
-				if box.box then
-					box.box.delete()
-				end
-				table.remove(boxes, k)
-				deleted = true
-				break
-			end
-			if not box.box then
-				box.box = self.bridge.addBox(
-					math.floor(self.x + (box.ax - 1) * self.multiplier),
-					self.y + y * 4,
-					math.ceil((box.bx - box.ax + 1) * self.multiplier),
-					4,
-					colors[bgColor],
-					self.backgroundOpacity)
-			else
-				box.box.setX(self.x + math.floor((box.ax - 1) * self.multiplier))
-				box.box.setWidth(math.ceil((box.bx - box.ax + 1) * self.multiplier))
-			end
-		end
-	until not deleted
-end
-
-function Glasses:write(x, y, text, bg)
-
-	if x < 1 then
-		error(' less ', 6)
-	end
-	if y <= #self.t then
-		local line = self.t[y]
-		local str = line.text
-		str = str:sub(1, x-1) .. text .. str:sub(x + #text)
-		self.t[y].text = str
-
-		for _,tf in pairs(line.textFields) do
-			tf.delete()
-		end
-		line.textFields = { }
-
-		local function split(st)
-			local words = { }
-			local offset = 0
-			while true do
-				local b,e,w = st:find('(%S+)')
-				if not b then
-					break
-				end
-				table.insert(words, {
-					offset = b + offset - 1,
-					text = w,
-				})
-				offset = offset + e
-				st = st:sub(e + 1)
-			end
-			return words
-		end
-
-		local words = split(str)
-		for _,word in pairs(words) do
-			local tf = self.bridge.addText(self.x + word.offset * self.multiplier,
-																		 self.y+y*4, '', 0xffffff)
-			tf.setScale(self.textScale)
-			tf.setZ(1)
-			tf.setText(word.text)
-			table.insert(line.textFields, tf)
-		end
-
-		self:setBackgroundBox(line.bg, x, x + #text - 1, y, bg)
-	end
-end
-
-function Glasses:clear(bg)
-	for _,line in pairs(self.t) do
-		for _,tf in pairs(line.textFields) do
-			tf.delete()
-		end
-		line.textFields = { }
-		line.text = string.rep(' ', self.width+1)
---    self.t[i].text.setText('')
-	end
-end
-
-function Glasses:reset()
-	self:clear()
-	self.bridge.clear()
-	self.bridge.sync()
-end
-
-function Glasses:sync()
-	self.bridge.sync()
-end
-
-return Glasses
diff --git a/sys/extensions/6.tl3.lua b/sys/extensions/6.tl3.lua
index 948cb30..ab4d93f 100644
--- a/sys/extensions/6.tl3.lua
+++ b/sys/extensions/6.tl3.lua
@@ -680,15 +680,6 @@ function turtle.gotoYfirst(pt)
 	end
 end
 
-function turtle.gotoYlast(pt)
-	if turtle.go({ x = pt.x, z = pt.z, heading = pt.heading }) then
-		if turtle.gotoY(pt.y) then
-			turtle.setHeading(pt.heading)
-			return true
-		end
-	end
-end
-
 function turtle.go(pt)
 	if not pt.x and not pt.z and pt.y then
 		if turtle.gotoY(pt.y) then
@@ -715,6 +706,7 @@ end
 turtle['goto'] = turtle.go
 turtle['_goto'] = turtle.go
 
+-- TODO: localize these goto functions
 function turtle.gotoX(dx)
 	turtle.headTowardsX(dx)