On Maneuvers: Reading and Boating
Author:
Dean Travis Clarke
Laptop Battery How to make sense of charts and markers on the fly.
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Thinkpad I remember my first professional captain's job when I was 14. The boat owners had plotted our course from Mamaroneck, New York, to Montauk. When I checked the markings on the chart I discovered they'd plotted a perfect set of routes -- if you didn't mind going straight across numerous landmasses in the process.
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Microsoft Even small children know what street signs mean. Stop, one-way and the like come easily. But boating is different. First of all, the words "map" and "sign" aren't even part of the lingo. Rather, charts and markers guide you, and it takes some savvy to know how to interpret them without pause.
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Laptop Computers As long as you're within sight of land and have a chart, there's no excuse for not knowing where you are. In addition to the buoys and such (called navaids in nautical parlance), charts also show significant shoreside structures. All you need to do is look across the top of your compass (you do have one, don't you?) and read what the bearing (direction) is to the structure that you see on shore and on the chart. Do this with several bits of structure and then plot those bearings on the chart using the compass rose, parallel rules and a pencil. Where all the lines intersect is where you're located. Then look at your depth sounder and see that the water depth matches that under the spot where all the intersects are on the chart.
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Laptop Computer I once had a crewman who couldn't navigate. As we traveled down the Atlantic coast, I had him steer by means of the depth sounder. I told him, "Keep the depth sounder on 50 feet. If the number goes up, steer a little right (toward shore). If it goes down, steer a little left (toward the deep)." With this simplistic navigation process, I was able to get a few hours sleep, confident he could stay out of trouble. It is perfectly acceptable to navigate according to depth contours by simply selecting a depth that more or less parallels your course while avoiding obstructions.
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Desktop Computer So what about navigation using markers? On the Intracoastal Waterway, the general rule says that red marks are on the mainland side of the channel. And of course, coming in from sea, it's always "red right returning" (in the United States). Perhaps the easiest way to remember what the marks mean is to keep a navaid sticker next to your helm. You can buy them for less than a buck at BoatUS, West Marine, Boaters World and most any other marine supply store. They also give you whistle signals that most boaters can't remember.
Notebooks Don't be afraid to alter your course and go right up to a marker to see what it is (at slow speed, of course). The absolute best proof of your exact position is to be right next to a marker with a number or letter. Then check its position on your chart.
Lenovo So, you say you don't need paper charts because you have an electronic chart plotter with built-in GPS? Remember two crucial things: 1. If it runs on electricity, it can suddenly stop working for numerous reasons -- none of which cares how inconvenient it might be to you. 2. Electronic cartography still has not been deemed a legal means of navigation. If you ever get into an accident due to a navigational error and don't have that "legal piece of paper" called a government-issued nautical chart, then you're toast.
Hard Drive Hand-held GPS Units
Travelstar * Thale Navigation's Magellan Meridian Color ($499) represents is the first full-color hand-held GPS to hit the market. The 8-ounce unit comes in a housing that fits in your pocket and floats if you drop it in the water. It comes with a built-in database as well as SD memory cards for downloading and storing additional data. Compatible with Magellan's MapSend cartography, you don't need to pay extra for charts of other areas. Contact: 909-394-5000, magellangps.com.
Gateway * Standard Horizon's new Magnum NAV-50 ($299) also comes with data CDs as well as loads of U.S. street maps. Pay a little extra and you can download C-MAP cartography for any region you choose. However, it comes with a pretty healthy built-in database of more than 31,000 navaids. Also built in is a WAAS (Wide Area Augmentation System) GPS engine that provides position fixes accurate to within about 10 feet, and a battery that lasts for about 50 hours of constant use. Contact: 562-404-2700, standardhorizon.com.
Laptop Parts * Garmin offers a powerful hand-held GPS in its GPSMAP 175 unit ($772). The 175's monochrome screen measures 4.1 inches diagonally and the unit runs on six AA batteries (10-hour battery life). It comes with Garmin's proprietary cartography that looks very much like a government chart -- but without the color -- and a dedicated Man Overboard button. Garmin makes hand-helds spanning the gamut of prices and features. Contact: 913-397-8200, garmin.com.
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