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Old 12-10-2013, 16:33   #76
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Re: Why AIS?

I hope I'm misunderstanding what is being posted about an Ipad here, because an Ipad that is simply reading internet AIS positions from a land based website is NOT good, certainly is not in real time. Sure I sometimes look at shore based AIS sites on the web, purely out of curiosity, interesting maybe but it is no more practical use than watching an episode of the Simpsons.

You can view real time AIS on openCPN nav software on a laptop or notebook etc, IF the device itself is connected both to an active AIS VHF receiver and an active GPS receiver but an Ipad is simply a display screen no more no less unless it has software and hardware added to it to make it more than that, doubtful in my book but hey it might be me that is going nuts here and missing something new from the great god Apple....
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Old 12-10-2013, 23:19   #77
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I have been using an ipad for AIS for my last few trips. It works great. I use a sitex class b AIS hooked to a Brookhouse iMux and a Raymarine C80 chart plotter. IMux takes the AIS and puts it out on 802.11 wifi to the ipad. I use iNavX on ipad to display it. It real nice to be able to move the chart and AIS display around the cockpit. Still have to look at Raymarine to see radar display.

Really recommend this set up. Used it from Seattle to San Diego, it made the night watch a lot easier.
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Old 13-10-2013, 00:38   #78
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Re: Why AIS?

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Originally Posted by BobnCamie View Post
Been away for awhile. Thank you all for responses. Went ahead and bought a ipad 4 and got the boat beacon app(ais). Seems to be ok, but we are 250 miles from the boat now,it is on the hard for the winter anyway. Been playing some with ais, seems ok.
The boat beacon app for the iPad relies on internet connectivity, and networked land-based AIS receivers. This will not work unless you have a solid internet connection. Even with the connection, the vessel positions you see on this app may be several minutes out of date, because of filtering that takes place in the receiver network. In some locations there will be no shoreside receivers at all, or there may be spotty coverage, so you will not see nearby AIS-transmitting vessels.

This app is great as far as it goes, but you should not rely on it for safe navigation.

Quote:
... Looked at the standard horizon 2150, but am really in no need for new radio, and seems from what I am told this is also a transmitter. This I cannot prove yet.
The Standard Horizon 2150 includes an AIS receiver. This radio is very useful as a stand-alone AIS receiver, or when connected to your chartplotter (etc), but it is definitely not a transponder (AIS receiver / transmitter) -- there is no AIS transmitter. You will need to connect a NMEA signal from a GPS to the radio.
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Old 13-10-2013, 05:58   #79
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Re: Why AIS?

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Originally Posted by rcmpegasus View Post
I have been using an ipad for AIS for my last few trips. It works great. I use a sitex class b AIS hooked to a Brookhouse iMux and a Raymarine C80 chart plotter. IMux takes the AIS and puts it out on 802.11 wifi to the ipad. I use iNavX on ipad to display it. It real nice to be able to move the chart and AIS display around the cockpit. Still have to look at Raymarine to see radar display.

Really recommend this set up. Used it from Seattle to San Diego, it made the night watch a lot easier.
that is a different and possibly useful use of the Ipad, in effect as a repeater, to the one I think was being suggested elsewhere which seems like it uses the landbased internet for it's vessel data not by using data directly from transmitting vessels
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Old 13-10-2013, 06:38   #80
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Re: Why AIS?

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I've found that in most cases Navy ships don't transmit AIS
QUICK!!!!!!!!!!!!! Go tell the Navy!!!!!!!!!!!!!!!!!!!! Norfolk Navy base has navy ships sending AIS!!! www.MarineTraffic.com



And this one is a long way out at sea. ^%nms from closest land (portorico) heading away from it.

Obviously when a navy ship is in a tactical situation, or a capital ship anywhere, its not going to be transmitting AIS but sure will know where you are.


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Old 13-10-2013, 07:20   #81
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Re: Why AIS?

Navy ships here in this area usually don't transmit AIS. Some times one (of the fleet) will and the other's don't.

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Old 13-10-2013, 08:44   #82
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Re: Why AIS?

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QUICK!!!!!!!!!!!!! Go tell the Navy!!!!!!!!!!!!!!!!!!!! Norfolk Navy base has navy ships sending AIS!!! www.MarineTraffic.com

...
Of course, as you've seen sometimes Navy ships do transmit AIS. A number of years ago I saw an aircraft carrier cruising up the California coast and sending AIS (I was monitoring from my house). I looked them up on the internet and discovered that they were heading back to their Washington home port after being deployed in the Persian Gulf. I found their contact info, and sent them a "welcome home" email greeting, and got back a very nice reply from one of their comms officers. I've seen other Navy vessels via AIS, including the mobile radar platform "SBX-1". Here's my write-up on that: AIS Experience Offshore?

But, from what I've seen at sea and in port, the Navy ships are usually silent.
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Old 15-10-2013, 07:49   #83
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Re: Why AIS?

I understand what you are saying about cell phone repeater,etc. Where we live here in northern Mn. There is no cell phone service, I had this iPad loaded as it's own hotspot. Not saying that this is best alternative,just saying this is better than nothing. Also,I am far more worried about the small,go fast week end warriors that cannot be seen. I am sure this will work when integrated with the HDS 7 that I have to tie in with. If not,still have it as back up charts,gps,maps,and so much more. From what this has saved already, we'll worth it. Found out wife bought a SH 2150 for my b day! Now have redundant ais,too. Receiver is all I wanted,anyway. Will be interesting testing next spring
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