The non-wifi version has been available for less than $10 for awhile. I have one on every boat and toolbox. As mentioned, trying to see into a mast in sunlight is very difficult without getting the phone/laptop into the cabin. I have one with a 10m cord, but it only works on some devices due to violating the USB spec. Also, the corded model requires your smartphone to support OTG connections (USB master) - Samsung does, Moto doesn't, Iphone might.
http://www.ebay.com/itm/USB-Endoscop...cAAOSwux5YKupf