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EAIS

This is an Extended Automatic Identification System. First of all, thanks to lunatigs for his microcontroller that is the basis of my microcontroller. This system is 100% compatible with his system.

https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1748013725



In order for this microcontroller to be multiplayer safe, I am seeding the random generator with GPS coordinates before using it.


This microcontroller uses time slots (aka ticks since midnight) to announce the next time slot, in order to avoid collisions. This also includes listening to other EAIS's announcements and not using their slots. Furthermore, the amount of time that passes between 2 transmitions is handled more dynamically. It ranges from 1 second at 16knots or above all the way down to 16 seconds while standing still.


I also added the ability to include information about the navigational status and waypoint eta, as well as waypoint x and y coordinates.


Yes, you read that right. This controller is able to transmit up to 20 characters of a ships name (as required by the standard). As lunatigs's version wasn't able to transmit text, I changed the character encoding to the AIS 6 bit ASCII encoding. It has a very limited set of characters that can be transmitted. See further down in the Sources section on the Wikipedia article about 6 bit character encodings to learn more about the limitations.


In order to keep the size down, I removed both debug connectors. This microcontroller includes an unused lua code block that contains the code necessary to decode the text.

If you plan to include this into a ship that you'll upload to the workshop, please consider setting the "random IMO number" option to on in order to avoid number collisions in multiplayer games. Furthermore, it would be nice to name either me or lunatigs because of the work that went into making it.

I currently don't have an interface for this that features the entire featureset of this AIS, although one is in the making. However, this microcontroller is compatible to lunatigs's display, so you can use this for now.





Wikipedia on AIS[en.wikipedia.org]
Deep dive about AIS messages 1, 2, 3[emsa.europa.eu] and 5[emsa.europa.eu]
More formal definition of the standard including the 6 bit ASCII encoding[www.itu.int]
Wikipedia on 6 bit character encodings. Scroll down to "SixBit ASCII (used by AIS)"[en.wikipedia.org]

1. imoNumber
   
2. nameByte
   
3. shipType
   
4. shipLength
   
5. shipWidth
   
6. gpsX
   
7. gpsY
   
8. speed
   
9. trueCompass
   
10. nextTransmission
    
11. nameByte1
    
12. nameByte2
    
13. nameByte3
    
14. navStat
    
15. eta
    
16. targetX
    
17. targetY

1. imoNumber
   
2. nameByte
   
3. shipType
   
4. shipLength
   
5. shipWidth
   
6. gpsX
   
7. gpsY
   
8. speed
   
9. trueCompass
   
10. nameByte1
    
11. nameByte2
    
12. nameByte3
    
13. navStat
    
14. eta
    
15. targetX
    
16. targetY

One of the following:


One of the following: