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HDS 7 Insight USA Inaccurate GPS?

 
Old 07-10-2011, 07:48 PM
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Default HDS 7 Insight USA Inaccurate GPS?

I just got an HDS 7 and am on vacation on the coast of SC (at the Isle of Palms). The HDS is impressive in general, but it seems screwed up as far as gps accuracy goes. I wired it up and hooked up the NMEA 2000 to my yamaha and that's it. I don't have any chips installed or anything, just the insight that is pre-installed (I assume, it was hurried install).

I'm disappointed in the accuracy of the grass lines and some of the topo lines. Some of the topo circles aren't even matched with the blue/light blue color changes that indicate depth differences as well. For example, where a deep hole is, there will be a circle/oval filled with light blue, but the topo line will be offset on top of it, like the map under the topo is wrong/inacurrate.

In some places, I know the water and just scoot through, then as I was coming back, I noticed my trail showed I had cut through the grass. I had come through at low tide, so that wasn't true. Again, it is like the grass/base map is shifted.

The biggest problem is that I do a lot of night boating during an SC shrimping season and accuracy of stuff is pretty important and my EAGLE was accurate enough that I could move along quickly even at night. The HDS/Insight makes me scared it isn't accurate enough to keep me safe.

Any experiences with this? What's going on? I'm not positive that my Insight is even working. I've checked my chart data selection and verified that Lowrance is selected and even selected Navionics, which wasn't any more accurate and I'm not sure which is which. I assume Insight is Lowrance, but is it on unit when it comes or did I miss a card in the box or something?

Long winded, sorry. Tried lots, got no better, just frustrated.
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Old 07-10-2011, 07:54 PM
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Sometimes it is so far off that the topo lines show up in the grass that I know is basically inches deep... this isn't reasonably accurate is it? I should expect better maps for this system shouldn't
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Old 07-11-2011, 09:50 PM
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Put some screen shots up on the main electronics forum and you can exchange ideas with other using them so they can check out how theirs do in those areas.
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Old 07-23-2011, 09:30 AM
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If it turns out you are dissatisfied, think about the Navionics Platinum Plus chip. I just picked my HDS-7 and chip up last night so I have not used it yet, but I decided to go with Navionics because I will only be fishing my local water in the Chesapeake Bay. The Navionic's detail is superior to the Insight Coastal for my application within the Bay. If you do trailer or run to distant locations, the Insight Coastal will cover you.
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Old 07-24-2011, 07:12 PM
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I have the hds-10 with insight. While boating the upper chesapeake i've found the gps data to be pretty accurate. When i pull up to a channel marker on my starboard side it;s dead on. I also use an external gps antenna on my nmea 2000 network for the source on my hds-10
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Old 07-24-2011, 07:26 PM
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Gentlemen, please understand that there are different degrees of GPS accuracy. At work we use survey quality GPS that is generally accurate both horizontally and vertically within inches, of course it is also tied into local GPS correction stations and costs tens of thousands of dollars for the whole system and it depends on the time of day, how long you've been set up and atmospheric conditions. Then there is also sub-foot accurate GPS which is a little less expensive, but will still run at least ten thousand and there is sub-meter accuracy, which may run you as much as five to seven thousand (without a multiple-function screen). For a $100 to $2000 unit, that you buy in a marine store, I am more than happy to be within 100 ft. Oftentimes in my line of work, I've found the GPS to be spot on (of course using very accurate, expensive instruments, using paid subscriptions for master station corrections), the map, or survey, is wrong. Gotta understand that many of these maps, surveys and charts were compiled over the last 200 years or more, they do have errors and are just wrong, or have not been updated. Read the fine print on any paper navigational chart. Just my experience and 0.02. Only a fool would rely on one source of information for navigational purposes, for that matter I never rely on any one source of information for any critical decisions. Look at the charts, watch your radar, watch your sonar, keep a sharp lookout, keep the stereo and cell phone turned off, keep your ears and mind open and do a sanity check, if something doesn't seem right, it probably isn't. Make your decisions on all your sensory input, not just the GPS. GPS will get you close enough. Long time ago on the rifle range someone said, "It's not the dope on the rifle, it's the dope behind the rifle". True then, true now.

Last edited by skipjack8342; 07-24-2011 at 08:07 PM.
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Old 07-24-2011, 09:31 PM
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make sure WAAS is enabled.
It probably came out of the box not enabled.
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Old 09-09-2011, 09:02 PM
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I have a HDS-5 with the lake insight maps and it is pretty much dead on on the 2 lakes I have used it at so far
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