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AIS range
- Thread starter pdecat
- Start date
Bruce it seems to mimick handheld VHF range on class B AIS. Class B AIS power is limited to 2 watts at the antenna port. I found purchasing an AIS specific(narrowband)fiberglass antenna and mounting it as high as possible on the hardtop really helped my reception of both AIS A & B. I typically see class A targets out to 20-25 miles. Now I have noticed like all VHF propogation there have been many nights I can see ships from Newport News VA, to Long Island Sound from just north of Atlantic City, NJ. This is my 3rd season with a Class B AIS transponder.
Bill
Bill
I tend to not pay attention to web based AIS because I don't know where the recievers are or how high they are on a tower and it's proximaty to the coast. For instance my area shows almost no AIS vessels on line. I have never seen my AIS on the web based sites however I can be seen and see ships that don't appear in my area on the web based AIS sites. There are too many unknowns with the web based sites some reporting stations may be a simple Omni on the roof of a shore house yet I know of some near New York that are on top of high rise buildings or towers that are 300-500 feet in the air.
Bill
Bill
I think it depends on the weather.
I work offshore in the Gulf of Mexico. We are ~ 100 ft. above sea level.
Sometimes we can see ships and boats 40 miles away on AIS and sometimes it is only 30 miles or so.
On exceptional days, we can see farther than 40 miles.
We have commercial AIS. So do the guys we see.
I work offshore in the Gulf of Mexico. We are ~ 100 ft. above sea level.
Sometimes we can see ships and boats 40 miles away on AIS and sometimes it is only 30 miles or so.
On exceptional days, we can see farther than 40 miles.
We have commercial AIS. So do the guys we see.
The AIS web sites show tracks from a network amateur receivers on land. If there is no receiver in a particular area the web displays will not show any tracks. Under normal conditions the reception range is limited by VHF line of sight; but under unusual conditions can sometimes be longer.
Mike
Mike
The AIS web sites show tracks from a network amateur receivers on land. If there is no receiver in a particular area the web displays will not show any tracks. Under normal conditions the reception range is limited by VHF line of sight; but under unusual conditions can sometimes be longer.
Mike
Mike