Unzip and move to your community folder. Ensure that your traffic settings for Ships and Ferries is between 5-10%.

if you use Addon linker to install you might get an error message; so far all users reporting this problem have managed to solve it with a new installation, but please contact Addon linker's author if you need support with installation with addon linker or use the above method which will work.

If you have the old V1 installed make sure to remove GAIST MSFS V1 and the GAIST MSFS V1 CVT folders before installation.

This depends on your settings and system. Models are made low poly and with low draw calls and are from V2 in native MSFS format so impact should be minimal.

I recommend you to use Little NavMap besides the sim - it will show you the presence of ships in the vicinity of where you fly including the name of the ships.

Remember to activate display of ships in LIttleNavMap - It is done clicking on the boat icon in the menu bar.

There are routes along most coastlines and some routes crossing Oceans, however the focus is on coastal areas. There are approx 24.000 ship movements programmed - spread them over the globe and comparte to around 300.000 ships in the real oceans... don't expect hundreds of ships everywhere - it would kill of performance.

There is generally no or few ships docking in harbors - due to the different sceneries used by different simmers the risk of conflicts is high if we let ships go into harbors. Most of the ships will be found between harbors on the major shipping routes.

If no ships show up there can be three main reasons...

You have an installation or setting issue

You fly in an area without or with limited ship traffic

The sim does not load the ship traffic properly

To check if you have an installation issue go to an area with a lot of traffic. I recommend departing from Calais, France flying towards Dover, UK - you should see both ferries and cargo traffic. If no traffic appears check the following - Did you install the unzipped GAIST_MSFS_V2 correctly in your community folder? if yes, did you adjust settings for Ships and Ferries  5-10%? You find that setting under general options traffic.

Of course you can be flying in an area with limited or no ship traffic. The routes are mostly along the coasts and they are preprogrammed following realistic patterns but this in not real time and to avoid performance issues traffic is not as high as in the real world. You can use LittleNavMap to see where the ships are during your flight. In order to see where the routes from the Global AI Ship Traffic are download the AI Ship Locator V2 by Carl Vokes from simviation.com. It contain most of the routes included in the project. 

Finally, the sim engine is not very stable when it comes to ships  - you might experience that ships do not show up as programmed and if you load the same flight another time they do show up - it happens in particular if you start your flight at a moment where the ships are waiting to depart, but it can also happen that the sim simply don't load a particular route or ship on a route during a flight. This has been reported to Asobo, but it might take time before it get high on the priority list. After all it is a detail in a complex sim.

This is not a Real Time package, however, the scheduled routes simulates realistic shipping routes, but with the difference that you will find little traffic in the middle of the Ocean as few people fly there and it would spend computer resources. Also you will not find many ships in ports to avoid conflicts with the different sceneries installed by different users and because the MSFS Sim engine doesn't work well in narrow spaces like ports.

For the moment - September 2021 -there is a bug in MSFS placing all AI ships at ocean level meaning that the AI traffic included for e.g. Amazonas, the Panama Canal, Mississippi or the Great Lakes will move below the water surface. Hopefully Asobo will correct and the traffic will reappear.