National Navigation System Division presents GPSRoutes

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. Enter LAT/LON. Enter message (not recommended) Waypoint number. (Keep it simple) Menu of waypoint options at bottom. Bearing and Distance 0001

GPS Position Page Time Direction bar at top of screen. Course and Speed Mileage and Altitude Position This is not a compass reading!

A simple waypoint entry screen

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

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

Waypoint Use Mark the boundaries between legs. WPT 1 WPT 2 WPT 3 WPT 4 Marks the turn in a channel Rock Marks hazards to navigation or obstructions.

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.

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

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 02 WPT 01

Why create a route? 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 1 WP 4 WP 2 WP 3

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

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. ROUTE Navigation WPT 1 WPT 2

C D 3. 1 C D 2. 4 ANIMATION WP 2 WP 1 WP 3 Establish a XTE safety zone Measure, plot, and label your course lines. Update your Trip Log. Determine the LAT/LON for each Waypoint and establish Waypoints in your GPS. On your nautical chart, stick small labels showing the Waypoint Number beside each WPT.

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

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

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. Alarm Sounds 1/2 M

Any questions ?