Maps that Measure Up
Author:
Tom Thompson
Laptop Battery Boaters must choose between two electronic chart formats - raster and vector. Raster charts are digitized photographs of paper charts. Vector charts are graphic interpretations of the information on paper charts digitized into an electronic database. The choice may be made for you, depending on your particular application. Navigation-software programs for computers use raster charts, and dedicated chart plotters use vector charts. Integrated GPS makes electronic charting possible. An icon that represents your boat's position on the screen moves on the chart as your boat moves on the water. Many boat owners found chart-plotting equipment very expensive when the technology debuted about 15 years ago. Still, chart plotters cost less than computers because they were less complicated to make. Vector cartography became popular with the recreational marine market, and raster cartography found its place in the commercial field. There is still a price difference today, but it has narrowed. You can buy a chart plotter for a few hundred dollars, while an onboard computer system costs several thousand. What should you consider when choosing an electronic-charting system for your boat?
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Thinkpad Aside from cost, one of the major factors is how you'll use it. A chart plotter offers the simplest solution for navigating familiar waters to get to your favorite hot spots. An onboard computer can be a very sophisticated tool for finding fish once you get there. The technologically challenged will find a chart plotter easier to use than a computer - it usually comes with one manual. For a computer system, you'll need to study manuals for the hardware, the operating system and the navigation software. In some instances, vector charts can be easier to read than raster charts because you can display as little or as much data on the screen as you wish. You control what appears because a vector chart is made from information in a database. With a raster chart's single image, you get all or nothing. Vector charts also maintain clarity regardless of zoom level. You can even add or remove chart information to make the presentation more readable at certain zoom settings. Text on vector charts remains upright regardless of the chart orientation. But use a north-up orientation on a raster chart and travel south in a course-up display mode and all the words will be upside down, just as when orienting a paper chart.
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Microsoft On the other hand, navigation-software programs can provide a wealth of sophisticated information that dedicated chart plotters cannot. Satellite imagery, available by subscription with some programs, shows ocean temperature and plankton concentrations. You can download weather data from the Internet and integrate it over a chart. Some programs are capable of displaying three-dimensional underwater views, which are actually a form of vector cartography. These views allow you to precisely locate underwater structure and find more fish. Presently, only computer-based software programs can read raster-based aerial photos. These bird's-eye images of the U.S. coastlines and regions such as the Bahamas can be displayed side by side or even blended together with raster cartography as an overlay in some programs.
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Laptop Computers When choosing an electronic-charting system for your boat, carefully consider where you'll put the display unit. This decision closely relates to cost, as well as to the kind of boat you own. While most marine chart plotters are water-resistant to some degree, nonmarinized computer equipment is extremely sensitive to moisture and salt - it must be protected. An ordinary laptop or desktop computer may be placed in a climate-controlled cabin or pilothouse. But expect to pay considerably more for hardware made for an open helm.
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Laptop Computer Another important consideration in choosing a chart format is the availability of detailed and frequently updated charts for the areas you fish. A chart's scale is its measure of detail - expressed as a ratio, such as 1:250,000 or 1:5,000. The smaller the number on the right, the greater the detail. Compare the smallest scales for each format and supplier you consider. Both raster and vector charts of U.S. waters use data provided by the National Oceanic and Atmospheric Administration. Chart makers update their products at regular intervals, but some areas are done more often than others. Frequency of updates doesn't vary between raster and vector, but by government-issued updates and cartography company. Within the past few years, some navigation-software programs have combined the best of both worlds: They have provided ways to display vector and raster charts not only side by side, but also blended. The chart of the future may well be a composite of both formats.
Katz runs the company with 22 paid employees and 300 volunteers who give technical support to new users and are compensated with free memberships (remember those days at AOL ). He rents space in two AT&T data centers, one in Manhattan, another inSecaucus, N.J., with $700, 000 worth of computer equipment, end servers from Dell Computer and five IBM Unix servers. The $2 million annual payroll is his biggest expense.
Desktop Computer Manufacturers
Notebooks Furuno USA
Lenovo 360-834-9300
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Travelstar Garmin
Gateway 913-397-8200
Laptop Parts www.garmin.com
Software Lowrance
Hard Drives 800-324-1356
Electronics www.lowrance.com
Canon Simrad
Desktop Pc 425-778-8821
Desktop Computers www.simrad.com
Think Pad Maptech (R, E)
Repair 888-839-5551
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Cisco SoftChart International (R)
Keyboard 866-707-6277
Monitor www.softcharts.com
Desktop C-MAP (V)
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Refurbished Laptops www.c-map.com
Wipro Navionics (V)
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Memory Nobeltec (V, E)
Intel 800-946-2877
As400 www.nobeltec.com
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Hardware 800-863-2347
Dual Xeon www.transas.com
Storage Nautical Technologies (E)
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Computer Sales www.thecapn.com
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Printers 888-764-2273
Technology www.maxsea.com
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