WAAS GPS Chart Plotters
Claims on the accuracy of WAAS (Wide Area Augmentation System) vary among manufacturers. Horizon plays it safe by rating its at three meters (just under 10 feet), which offers better-than-DGPS accuracy without a separate beacon receiver and antenna or the need to be within 200 miles of a land-based differential tower. Standard Horizon offers a WAAS GPS model for just about everyone. On a budget? The Horizon CP150 chart plotter gives you C-Map NT cartography, a 5-inch monochrome LCD screen and a three-year waterproof warranty and flat-rate program, all for an expected street price of $400 ($711 list). The CP160 model steps up to a 6-inch monochrome screen, dual C-Map NT cartridge slots, backlighting for the display and the key pad, and a quick-release mount with integrated power and data connections. It's 'xpected to sell for around $600 ($1,067 list). The Horizon CP170C version presents all the capabilities of the CP160 on a transflective color LCD screen designed for use in direct sunlight. It lists for $2,980, but the street price should be about $1,500.
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Generally, or model of chart plotter is designed to operate with a particular digital chart manufacturer's platform, compatible. Among some of the popular plotter brands, for example, Northstar and Lowrance machines operate using Navionics charts, as do some of the models in the Raymarine line. Garmin plotters use the company's own proprietary Blue Chart digital charts. MAP NT+. MAP charts are used in the widest variety of plotter brands, (17 North American based manufacturers and 50 worldwide) including Furuno, Raymarine, Tex, Simrad, Standard Horizon, Navman, JRC and Interphase. As always, though, check with the plotter manufacturers to verify chart compatibility before making a decision.
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As is true for all GPS usage, the location and environment of the user will cause variability in WAAS performance. For instance, the position of the satellites over the equator make it difficult to receive the signals when mountains or trees obstruct a clear view of the horizon. Therefore, area situations. Unlike DGPS (differential GPS), WAAS does not require additional receiving equipment.
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