Below answers and explanations to some of your questions and comments.
Not entirely correct. You need to understand there are two different ways for AI boats operate. Leisure boats density is controlled through the Leisure Boat traffic setting. They spawn at random in certain areas and they sail in what ever direction. They spawn around populated areas when you fly there. They don’t follow routes and are therefore quite performance neutral. Global AI Ship Traffic does not include at this point leisure boats spawning in this way. Enhanced AI replaces the default boats spawning with nicer models, but is correct that they Enhanced AI do not change anything on where they spawn - it is all controlled by the sim engine, however, if you want you can treat a yacht as it was a ship and as described below place it on a route and thereby manually increase the density of pleasure boats.
Ships and Ferries are on the contrary controlled by a schedule files and routes files made by the developer. You can increase your setting for ships and ferries but ultimately the developer decides how much you will see.
The first section of the schedule file defines a traffic setting at which the particular route and ships on that route are activated. All ships in Global AI Ship Traffic are so far set to appear at 5%. In the default the value goes from 1% to 100%.
The below are lines from the file controlling the default AI and Enhanced AI. Each line includes a ship “AC#3” corresponding to a particular model, a ship name “B2576”, a traffic percentage “36%” and a repetition time - here every “6Hr”, a departure and arrival time for outbound, a route number referring to a KML route file defining the route, a behavior at the end of the trip (ferry or cargo) a departure and arrival time for the return, route number and a behavior. Arrival times are calculated based on a speed set for each ship on each route in another file and the length of the route. The sim checks all these program lines a start up which increases load time.
AC#3,B2576,36%,6Hr,00:05:26,01:42:52,2847,reverse,ferry,03:05:26,04:42:52,2847,normal,ferry
AC#3,B2176,1%,4Hr,01:09:55,01:55:11,2837,normal,ferry,03:09:55,03:55:11,2837,reverse,ferry
AC#5,B2416,55%,12Hr,04:51:47,09:23:53,2823,reverse,ferry,10:51:47,03:23:53,2823,normal,ferry
AC#4,B2336,66%,2Hr,00:05:36,00:13:54,1930,reverse,ferry,01:05:36,01:13:54,1930,normal,ferry
AC#4,B2256,66%,2Hr,00:26:59,00:37:19,2807,normal,ferry,01:26:59,01:37:19,2807,reverse,ferry
So it is possible for the developer to control 100% when and where ships and ferries appear - at least when there is no bugs like it is unfortunately the case after SU5. And you can add leisure boats in the same way, but it is a hell of a lot work and not good on performance compared with the inbuilt spawning. Global AI Ship traffic includes some yachts, sailboats, and motorboats sailing on routes in some areas like Cote d’Azur, but not a lot.
The default AI/Enhanced AI file contains approx 600 such programming lines corresponding to 600 voyages (1200 counting t/r) divided between the 14 default ships. Equally Enhanced AI contain the same 600 ship voyages equal to 42 repetitions of each ship on average.
Global AI Ship Traffic contain approx 24.000 lines corresponding to 24.000 voyages (48.000 legs counting t/r) divided between the 1300 ship models. That gives an average of 18 repetitions per ship, however one car carrier model is the champion with 122 voyages across all parts of the world and the ferries only function on one specific route.
So obviously choosing between those two you don’t loose anything by choosing Global AI Ship Traffic. You get more and more diverse traffic at 5% with Global AI Ship Traffic than at 100% with default; but you are free to chose. If Seafront continue their present model of charging for add ons containing the same ships in different packages I guess most users will spend their full sim add on budget way before reaching the numbers and diversity achieved in the Global AI Ship Traffic. Remember their Global Shipping uses again the same ship models as Enhanced AI and before that Anguila and just adds 5 new… Global AI Ship Traffic has existed since 2013 and adds around 100-150 new ships per year - this year apart from the Global AI Ship Traffic for MSFS we launched 250 classic ship models for FSX/P3D based on ships from the sixties…
Among the 600 default AI ship routes quite a few are related to ferries… And if you turn up the traffic setting to 100% the ferry routes is exactly one of the places where you will have conflict between default/enhanced AI and Global AI Ship Traffic. The Global AI Ship traffic contains models of the real ferries and they are put on the same routes giving you ships on top of each other at end points, disappearing, colliding etc… Also at end points for the cargo routes you will see the same issues. Therefore Global AI Ship Traffic is designed with 5% to appear at a traffic setting where almost no default ships would appear - it was a simple way to avoid telling users to mess with their standard set-up and delete the default file containing the TrafficBoats.bgl to avoid the conflicts. Now Seafront recommend 100% for ships and ferries which is in conflict with Global AI Ship Traffic. I
Finally… the routes added by Seafronts second add on Global Shipping are according to Seafront mostly across oceans; the routes in Global AI Ship Traffic are mostly along the coasts, and the routes in Default AI is a slightly strange mix… In that way Global Shipping and Global AI Ship Traffic can to a certain level complement each other, but I have not analyzed their route end points so I can’t say if there are conflicts in e.g. harbors - but that package require both Enhanced AI and high traffic settings so again you create a conflict - AND - AI ship routes pull performance at start up while calculating routes, so if you have performance issues, high AI ship traffic setting and having a lot of routes in areas you don’t fly in will increase load time, so you might need to make a choice.
@FlyingFishin - @Kjave767 I hope the above answered your below questions. Further questions should probably be asked to Asobo, because they have designed the AI sim engine. They do think about an AIS based AI ship traffic which would completely change the above, but I think they have other things to solve first…
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