tag:blogger.com,1999:blog-4778505478099828368.post6339999771518796110..comments2024-03-21T12:05:02.193+00:00Comments on Crystal Blues: Dangerous AIS Targets? New Challenges To Safe NavigationNeil & Leyhttp://www.blogger.com/profile/05003534197946819046noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-4778505478099828368.post-58747622404544765542018-08-08T20:40:43.030+01:002018-08-08T20:40:43.030+01:00As a future east coast 'snow-bird' I read ...As a future east coast 'snow-bird' I read you article with much interest. <br />Thank you.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-73549505899531108982018-07-03T14:46:31.009+01:002018-07-03T14:46:31.009+01:00I've encountered this issue a few times, the o...I've encountered this issue a few times, the only "solution" is to check the MMSI number; I explain as "good" MMSI numbers are given by countries they have their own inicial numbers. You can check all over the web the so called MID; to not let my explanation go too long, and not going into much detail. First number 0: land station<br />2-7 ship<br />other numbers, like your example 9 99% chance not ship.Anonymoushttps://www.blogger.com/profile/05135554688056247505noreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-11718687199319422332018-07-02T16:20:10.762+01:002018-07-02T16:20:10.762+01:00Thanks for the very interesting and informative po...Thanks for the very interesting and informative post ... I would point out 1 useful piece of information here. All the The "odd" targets you saw had an MMSI started with 941 (in the graphics.) MMSI's are kind of like phone numbers, with area codes. The first 3 digits are the maritime identification digits (MID) and are assigned either geographically or by function. I have two - 1 portable, 1 fixed station) in the USA. The handheld starts 367, the fixed station 368. Numbers starting with 9 are "free-form" and do appear to be able to be set by the manufacturer. Digits 4 & 5 are manufacturer code, the balance are up to the factory to set. HOWEVER, 941 appear to be UNDEFINED. 970 is SART, 972 MOB, 974 EPIRB w/AIS, etc. 941 appears to be a rogue number BUT if you see an MMSI starting with 9, it's should be some kind of special device and NOT a vessel...<br /><br />https://en.wikipedia.org/wiki/Maritime_Mobile_Service_Identity<br />Anonymoushttps://www.blogger.com/profile/07644604918549315704noreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-66215471467915265732018-06-28T06:14:45.590+01:002018-06-28T06:14:45.590+01:00The fish marker AIS's are pretty common (100&#...The fish marker AIS's are pretty common (100's)in the East and South China Sea. They are a bit annoying because they clutter the radar screen but once they're understood to be fish markers, they're not that big of a dealAnonymoushttps://www.blogger.com/profile/13727054642521060563noreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-7171847690401858192018-06-25T16:24:12.918+01:002018-06-25T16:24:12.918+01:00Thank you for bringing this to my attention. I hav...Thank you for bringing this to my attention. I have of course been aware of the AtoN topic and "virtual buoyage", which, being regulated and, presumably, standardized, could be a boon to navigation in tricky areas, but this is not that. It's just a greedy, opportunistic exploitation of an existing system that risks degrading it to the point of uselessness. Why, yes, I just installed a Vesper XB-8000.Rhyshttps://www.blogger.com/profile/00598445145507204424noreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-32799051958062553612018-06-24T02:10:08.330+01:002018-06-24T02:10:08.330+01:00Very interesting post - thank you. But we certainl...Very interesting post - thank you. But we certainly don't want to run into nets or other fishing gear. Last year 3 cruising boats in the Sail 2 Indo rally turned on their EPIRBs because of tangles with (illegal) long lines in SE Indo, & we're constantly dodging nets & pots in the Malacca Straits. Marking that junk with AIS sounds like a useful idea, but you're right that it needs to be better defined. IMHO, what we need are AIS codes for fishing gear (& updates to our AIS/nav software so we can display them properly) that allow for fishing devices to be seen & differentiated from boats & AtNs. And those devices should probably carry the MMSI of their owners (how do personal AISs work this?).Jon Hackinghttp://svocelot.comnoreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-75900485269515620302018-06-19T23:20:30.672+01:002018-06-19T23:20:30.672+01:00This comment has been removed by the author.Neil & Leyhttps://www.blogger.com/profile/05003534197946819046noreply@blogger.comtag:blogger.com,1999:blog-4778505478099828368.post-53528167365575086602018-06-19T23:12:15.725+01:002018-06-19T23:12:15.725+01:00This comment has been removed by the author.Neil & Leyhttps://www.blogger.com/profile/05003534197946819046noreply@blogger.com