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National Navigation System Division presents

National Navigation System Division presents. GPS Routes. A waypoint (WPT or WP) is a designated location with geographic Coordinates—a Fix. A group of waypoints, linked together in a logical sequence on a GPS, is called a “ route .”. Entering Waypoints. Enter in name/icon.

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National Navigation System Division presents

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  1. NationalNavigation System Division presents GPS Routes

  2. A waypoint (WPT or WP) is a designated location with geographic Coordinates—a Fix.

  3. A group of waypoints, linked together in a logical sequence on a GPS, is called a “route.”

  4. 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 andDistance 0001

  5. GPS Position Page Time

  6. Verifying your present position as a waypoint WPT 4 • 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. WPT 3 WPT 2 WPT 1

  7. 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.

  8. Waypoint Use Rock WPT 4 Mark the boundaries between legs. WPT 3 WPT 2 WPT 1

  9. 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.

  10. Select waypoints that can be easily verified by other methods--visual fixes, soundings, radar, etc. NEVERrely on one means of navigation.

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

  12. 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 the distance that you travel. WP 3 WP 2 WP 1

  13. WP 4 Editing Routes • GPS receivers should allow you to delete, move, or append waypoints. • In this case: • WPT 2 will be deleted and moved. • WPT 3 will be changed. • WPT 4 will be added. WPT 3 WPT 2 WPT 3 WPT 2 WPT 1

  14. ROUTE Navigation WPT 2 • 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 leg (DTG) • Total time to end of route. WPT 1

  15. WP 3 C 225 D 2.4 WP 2 C 224 D 3.1 WP 1 ANIMATION

  16. Highway Page on GPS Added line showing vessel direction 095º T Next waypoint Difference between line and the center of the road is XTE (Cross Track Error) Turn to starboard to go to next waypoint

  17. GPS Route Page Display • Perspective view of upcoming waypoints • Shows if you are heading for next waypoint • Customized data fields not needed.

  18. Arrival Alarm Sounds whenever the boat penetrates an adjustable ring around a waypoint. Initiates new heading data for the next leg in your route. Note that waypoint is positioned just off the ATON not on top of it. 1/2 M Alarm Sounds

  19. Any questions ?

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