[Public-List] iPhone AIS receiver
Meinhold, Michael J.
MICHAEL.J.MEINHOLD at saic.com
Mon Sep 24 08:06:23 PDT 2012
Although I firmly agree with John and Larry's Amen, I have a little
story from the Queenstown race that says something for GPS.
I was singlehanding home from Queenstown yesterday. We had to tack down
the Chester until we could round the red nun at Love Point.
I had some sail repair issues, and had to switch jibs mid race, so
suffice it to say I was way behind. My little handheld GPS was not
functioning, but I thought I knew where I was and where I was going. As
I finally got within about 1.5 miles of the turn, I spotted the red nun,
and I concentrated on my tell tales, occasionally coming up to the high
side. The wind was variable, and it seemed every time I looked at the
mark it was abeam, and I just had to keep steady on the wind to get to
the layline. This went on for almost 45 minutes - I thought maybe the
current was the problem, but I was moving on the land - I just could not
reach that layline. I finally got out binoculars and it turned out I
was trying to make a sailboat with a bright red sail on the other side
of the bay!
Rinn Duin #272
From: public-list-bounces at lists.alberg30.org
[mailto:public-list-bounces at lists.alberg30.org] On Behalf Of Lawrence
Sent: Monday, September 24, 2012 10:47 AM
To: Alberg 30 Public List -- open to all
Subject: Re: [Public-List] iPhone AIS receiver
Sent from my iPhone
On Sep 24, 2012, at 9:42 AM, John Riley <jriley at dsbscience.com> wrote:
> I played around with that app a while back, and there is simply no way
> it is displaying all vessels within a given region. I looked at the
> Chesapeake, areas like Savannah Approach and around New Orleans, and a
> few other busy ports.
> Sometimes, there was only one or two vessels shown.
> Either the app does not get all AIS equipped vessels or there are very
> few AIS equipped vessels. Either way, I'll stick to the Mark I
> Eyeball...which has the added advantage of not requiring cell
> Apologies if I sound like a technophobic curmudgeon again, but the
> thing I really hate about all these "modern tools" (gps,
> chartplotters, etc) is that they pull the focus into the boat. The
> dangers lie outside and around me...THAT's where I want to be looking.
> Yes, I've been aboard a power vessel going 30 knots where the skipper
> at the helm was looking DOWN at the dot on the chart plotter while
> piloting his vessel in a narrow channel and with other boats nearby.
> Speed was a problem, but so was focus of attention to a screen at the
> helm station rather than out, as "Proper Lookout" demands.
> Michael Grosh wrote:
>> Android users can use MarineTraffic.com. I use it all the time, and I
>> am on a boat with full featured AIS, chart plotter overlay, etc.(AIS
>> is VHF line of sight, the smart phone app uses shore stations for
>> unlimited range-theoretically).
>> Costs nothing.
>> On Sep 23, 2012 7:46 PM, "Greenhouse, Matthew A. (GSFC-6650)" <
>> matthew.a.greenhouse at nasa.gov> wrote:
> John S. Riley
> S/V Gaelic Sea
> 1972 Alberg 30 #521
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