  Shipbuilding companies are upgrading their inner workings in order to create
Shipyards 4.0, where the principles of Industry 4.0 are paving the way to
further digitalized and optimized processes in an integrated network. Among the
different Industry 4.0 technologies, this article focuses on Augmented Reality,
whose application in the industrial field has led to the concept of Industrial
Augmented Reality (IAR). This article first describes the basics of IAR and
then carries out a thorough analysis of the latest IAR systems for industrial
and shipbuilding applications. Then, in order to build a practical IAR system
for shipyard workers, the main hardware and software solutions are compared.
Finally, as a conclusion after reviewing all the aspects related to IAR for
shipbuilding, it is proposed an IAR system architecture that combines Cloudlets
and Fog Computing, which reduce latency response and accelerate rendering tasks
while offloading compute intensive tasks from the Cloud.
