These are the frequencies of DAC FID pairs in AIS Message 6 in data coming over AISHUB. 1586084 messages were recorded and analysed with R. With the pages from Arundale, gpsd and VT-Explorer a guess was made about the content of some of these messages.
Continue reading Frequency of DAC FID pairs in AIS Message 6
How to visualize global ship AIS directed communication?
Many AIS messages target specific MMSI. This means a Vessel or VTS (Vessel traffic service), or AtoN (Aid to Navigation) targets its messages to a certain MMSI destination. These messages can be binary, ASCII, Acknowledgements, GPS corrections, interrogations or assignment mode commands.
Continue reading How to visualize global ship AIS directed communication?
The most common Aids to Navigation (AtoNs)
1496 unique MMSI were extracted from AISHUB‘s data feed from Message 21 (Aid-to-Navigation Report). This was analysed with a simple R script.
Interestingly many windfarms in the North Sea report as AToNs.
World wide frequency of ship types
I collected data from ~60000 Class A and 20000 Class B ships via AISHUB.
Message 5 and 24 include a ship type identification as described here (Table 11). Continue reading World wide frequency of ship types
Two Years Weather Summary
This is the summary of our weather here, collected over two years. Data was logged from a N23DQ 2.1.3 OS: 3.0.9 into MySQL as also seen in Periodic sending. The data gets send to a PHP script on a remote server that then makes graphs, overlays this onto a webcam picture, updates the MySQL database and sends the data also to Weather Underground. But Weather Underground does not give me overall mean temperatures, and does not log certain values, but samples more often, while I took samples every 5 minutes in my own data base. Discrepancies in the histogram and the WU data are explained through this. The peak value of 42 degrees would also have been achieved in full sun exposure. Continue reading Two Years Weather Summary
AIS Message 12 Graph (Interconnections)
Worldwide AIS Message 12’s were collected via AISHUB’s raw data feed and entered into MYSQL. AIS Message 12 is an addressed Safety-Related Message.
Continue reading AIS Message 12 Graph (Interconnections)
Most reported AIS CLASS A destinations
These are the most reported destinations from 51444 ships (MSSI) (AIS Message 5) as pulled from AISHubs data feed. Interestingly major harbours from the People Republic of China are under represented. Possibly because of a language barrier. Overall, over the whole set, the freely to be entered destination field has very varied entries, from obscure entries to nothing or just question marks. The data was cleaned for the most common mistakes, like added spaces or useless punctuation.
Continue reading Most reported AIS CLASS A destinations
Most common AIS Class B vendor IDs.
After receiving AIS Type 24, Messages (Static Data Report) of 16085 different MMSIs (ideally Class B ships), the following seem to be the most commonly used Vendor IDs.
Travel Distances of Clyde Estuary Calmac Ferries
Travel distances of Clyde CalMac Ferries
| Name | MMSI | Distance traveled (km) | Daily km traveled | Yearly km traveled | mean daily return crossings |
|---|---|---|---|---|---|
| Loch Shira | 235053239 | 6358.547 | 94.90369 | 34639.85 | 25.10680 |
| Argyle | 235052541 | 9859.771 | 147.16076 | 53713.68 | 6.523083 |
| Bute | 235025112 | 8482.798 | 126.60893 | 46212.26 | 5.612098 |
| Coruisk | 235008929 | 4393.820 | 65.57940 | 23936.48 | 2.906888 |
https://www.calmac.co.uk/largs-cumbraeslip-cumbrae-ferry-winter-timetable
https://www.calmac.co.uk/wemyss-bay-rothesay-bute-ferry-winter-timetable
By logging to a Mysql table all recorded GPS positions, we see the workload that is put on these RoRo ferries.
Continue reading Travel Distances of Clyde Estuary Calmac Ferries
Most common ship names
After logging 13371 Class B Message 24 and 44676 Class B Message 5 AIS messages received from AISHUB including my own AIS feed with my version of aisparser, these are the most common transmitted names. Names were exported to CSV and cleaned for punctuation characters, and unnecessary spaces.
Continue reading Most common ship names