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NAVISTAR GPS

THE OFFICIAL NAME IS. NAVISTAR GPS. NAVISTAR GPS. NAVI gatonal S ystem using T iming A nd R anging G lobal P ositioning S ystem. GPS is a satellite navigation system developed by the US Dept. of Defense (DOD). GPS provides continuous,

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NAVISTAR GPS

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  1. THE OFFICIAL NAME IS NAVISTAR GPS

  2. NAVISTAR GPS NAVIgatonal System using Timing And Ranging Global Positioning System

  3. GPS is a satellite navigation system developed by the US Dept. of Defense (DOD)

  4. GPSprovides continuous, all-weather, three-dimensional positioning information (position, speed and time)

  5. GPS is used by aviators, mariners, surveyors, off-roaders, truck operators, bikers, hikers, hunters & fisherman

  6. 10-12 meters 5-10 meters 12-14 meters

  7. GPS positions are not error free!

  8. CEP = Circular Error Probable SEP = Spherical Error Probable

  9. 24 hours 5/2/2000 24 hours 5/1/2000 With Without Selective Availability 95 % of the time within 45 meters within 6.3 meters or 148 Feet or 21 Feet

  10. Datum is a chart coordinate reference system.

  11. A datum is shown on every chart Your GPS receiver must be adjusted to the datum printed on the nautical chart that you are using.

  12. WGS-84 is the standard, NAD-27 is common. Becomes more important as local datum become increasingly offset from WGS-84. Shown on the General Information Blocks of most charts/maps. Selecting the correct datum

  13. WGS1984

  14. You should have already selected and set up: A true or magnetic direction, Nautical miles, The 24 hour clock GPS Setups

  15. What is it telling you? GPS Receiver Display

  16. Basic GPS Receiver Functions • Provide details of your GPS system’s status. • Shows the satellite positions and signal quality.

  17. GPS Satellite Status Bar graphs give an immediate indication of signal strength

  18. Always validate satellite performance before using your GPS set for navigation.

  19. GPS Position Page Time

  20. Continuously determines your position. Displays the time. Shows a heading and SOG—speed over the ground--on the present leg. Show a BRG--bearing and a DTG--distance to go—to the next selected waypoint. Basic GPS Receiver Functions

  21. Shows the distance you are off track XTE - cross-track error. Shows TTG- time to goto waypoint. Uses SOG. Estimates the time of arrival--ETA--at waypoint. Uses SOG and DTG. Basic GPS Receiver Functions

  22. +/-Plus or Minus Key 0-9Numeric Keys A-ZAlphabetic Keys ENTTurns cursor on or off. Opens or confirms data entry. MENUTurns Menu Bar on or off. MOBActivate Man Overboard function. + Zoom InSmaller overview – more details. - Zoom Out– Larger overview – less details. Keyboard Orientation

  23. O Cursor Key – multi-directional. GOTOActivates POP-UP window. Selects NAV MODE. Short cut to chart display. PLOTSelects PLOT MODE. WIN Toggles between selected windows. Returns system to manual operation. CLR Turns off Menu Bar. Turns off Cursor. Deletes data. PWRTurns unit on and off. Keyboard Orientation

  24. Hand-helds

  25. 1. Learn how to inputwaypoints. 2. Learn how to usewaypoints.

  26. A waypoint (WPT or WP) is a designated location with geographic coordinates.

  27. Store present positions. Enter a position. Rename, edit, and copywaypoints. Create and edit routes. Delete waypoints and routes. You need to learn how to:

  28. Entering Waypoints • Enter in name/icon. • Enter LAT/LON. • Enter message (not recommended) • Waypoint number. (Keep it simple) • Menu of waypoint options at bottom. • Bearing and Distance

  29. Use a simple numbering system. Do not place your position on top of the Aid. Risk of collision! Validate every waypoint before using it as a permanent waypoint in a route. Verifying your present position as a waypoint WPT 4 WPT 3 WPT 2 WPT 1

  30. Waypoints are used extensively in GPS navigation: As boundaries between voyage segments – LEGS. To mark turning points, destinations, and aids to navigation. To mark hazards to navigation.

  31. GPS receivers enable waypoints to be entered and stored in various ways. A sequence of waypoints can define a planned route. Most GPS receivers store routes as well as waypoints

  32. Waypoints are often used to define route segments – legs. Insert waypoints at all turn points on your courses. Establish some voyage waypoints close to (but not at) aids to navigation

  33. Always pre-plot all waypoints on a nautical chart and measure the distance and bearing between waypoints. Verify that the trip legs are planned in safe water. Record the data on a Trip Log.

  34. Waypoints do not have to be located in the water--e.g., locate a waypoint at a lighthouse to enable you to know where and when to look for it Waypoints can be used to mark hazards to navigation--areas to avoid as well as areas to visit safely.

  35. Select waypoints that can be easily verified by other methods--visual fixes, soundings, radar, etc. NEVER rely on one means of navigation.

  36. WPT 02 • It is important to check your chart before establishing WPTs. • If the course crosses an island, the GPS receiver will direct you to navigate into this hazard. WPT 01

  37. Why create a route? WP 4 • Routes are lists of sequential waypoints. • GPS can automatically advance you to the next waypoint. • Routes can be reversed to retrace your original track. • Routes keep you from wandering into danger and shorten distance traveled WP 3 WP 2 WP 1

  38. WP 4 Editing Routes • GPS receivers should allow you to delete, move, or append waypoints. • In this case: • WPT 2 has been deleted. • WPT 3 has been moved. • WPT 4 has been appended. WPT 3 WPT 2 WPT 3 WPT 2 WPT 1

  39. GOTO Navigation • Used by any boat in open water to navigate to a single waypoint. • Useful functions: • Range and Bearing • Speed of Approach • Turn

  40. Range and Bearing • The distance and direction to a waypoint. • Probably the most useful of all navigation functions. • Know your units: true vs. magnetic, statute vs. nautical 3.2 NM, 030°

  41. Course To Steer gets you back to the course line at a 45° intercept to try to keep you out of trouble Desired Course Line CTS Bearing Third Reef Course To Steer

  42. WPT 2 ROUTE Navigation • Used by boats under power when they have to stay in a channel or follow an exact course line • Useful functions: • Cross Track Error (XTE) • Course To Steer (CRS) • Time To Go (TTG) • Automatic course change at next waypoint (WPT) • Total distance to end of route (DTG) • Total time to end of route. WPT 1

  43. Learn to use Alarms

  44. GPS Alarms • Anchor alarm • XTE Alarm • Waypoint Arrival

  45. Arrival Alarm Sounds whenever the boat penetrates an adjustable ring around the destination waypoint 1/2 M Alarm Sounds

  46. latitude longitude

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