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Old 30 October 2007, 11:08   #1
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Plotters and VGA output

I've been undating my nav stuff and chosen a unit which can drive a monitor on a VGA output. It's very satisfactory. Take a look. My plan is to use it as the main screen. Using WAAS or EGNOS ...look at the EPE!

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Old 30 October 2007, 11:30   #2
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Using WAAS or EGNOS ...look at the EPE!
.
I take it that's your positional error? Pretty good.

OTOH, an error of 6.5 feet on a trip of 29.5 feet is pretty wide...

How are you powering your monitor? Does it run off 12VDC?


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Old 30 October 2007, 13:08   #3
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I take it that's your positional error? Pretty good.
EPE = Estimated Position Error

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OTOH, an error of 6.5 feet on a trip of 29.5 feet is pretty wide...
Well, I've moved from chair to chair!

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How are you powering your monitor? Does it run off 12VDC?
Yes, if you search around you can still find monitors with an external power supply. I've got 3 of them. Two are a few years old when it was common to do that and the one in the picture I bought last week. They're all 12v so that appears to be a bit of a standard.
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Old 30 October 2007, 18:18   #4
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Well, I've moved from chair to chair!
Well not very fast, look at your SOG
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Old 30 October 2007, 19:58   #5
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Old 31 October 2007, 11:56   #6
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Well not very fast, look at your SOG
Didn't want to spill his beer.


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Old 31 October 2007, 18:38   #7
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One little flaw.... can you read it in sunlight. I know of someone who bought some french/italian? GPS unit (Lorenz) which plugs into a VGA monitor, but can't see the bugger in the cabin on bright days.
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Old 31 October 2007, 20:48   #8
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One little flaw.... can you read it in sunlight.
I don't need to. My cabin was deliberately designed to have subdued light for night use. With the exception of the dash, everything forward of the driving position is black. However, the photo is taken in my conservatory which has glass all around and a clear roof so the performance is pretty good. The problem may be the opposite and a dark screen may be needed for night use to lower the minimum brightness, but that's easily done.

The plotter here is at maximum brightness but the monitor has a lot of adjustment left on its controls so it'll be interesting to see whether it can cope with very bright light.
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Old 31 October 2007, 21:42   #9
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... if you search around you can still find monitors with an external power supply.
I've been looking at something like this for my expenditure adverse father, he wants to connect his handheld GPS to a laptop chart plotting program then have an external monitor from the laptop to the (yacht) cockpit.

The only ones I've been able to find are 12 v in car LCD ones (7" or 8") $US 250 or so or VERY expensive marine LCD screens. I would have thought that given the cheapness of big LCD's, small ones would be quite cheap.

I had this bright idea of using the screen from an old laptop, but after reading a thread where it took a bunch of techos years to sort out how to do it (and then it looked like a dogs breakfast) I gave up on that idea.

So, any pointers to a budget small 12v LCD to run a VGA output would be most appreciated.
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Old 01 November 2007, 07:10   #10
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Google and ebay are reasonable places to start looking. Be aware that many of the smaller screens have poor characteristics; viewing angles, brightness, colour saturation etc.

The one in the picture is a Brimax which is 12v and also has a protection screen, which I was led to believe is toughened glass, but I've dismantled the unit and it's actually plastic but it appears to have a hardened surface.

My other 12v units are NEC and Samsung. The Samsung is also a tv so there could be a plus to that.

If you find a nice monitor but it has a built in power supply, it's not major to buy a small inverter which will convert 12v into 230vac. You can find these in the UK for about the cost of a fish supper and a couple of beers. The smaller ones run at about 90% efficiency so they are not going to soak up the current too much. It's not a bad idea to have one onboard anyway.

Given that you are in Ozz, bear in mind Erin's comments about bright sunlight on the screen.
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