Session 10 ROUTES

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Session 10ROUTES
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• A waypoint
• (WPT or WP)
• is a designated
• location with
• geographic
• coordinates.

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

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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

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GPS Position Page
This is not a compass reading!
Direction bar at top of screen.

Course and Speed
Mileage and Altitude
Position

• Time

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A simple waypoint entry screen
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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
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• 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.

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Waypoint Use
Rock
Marks hazards to navigation or obstructions.

• Mark the boundaries between legs.

WPT 4
Marks the turn in a channel
WPT 3
WPT 2
WPT 1
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• 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.

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

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• 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
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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 4
WP 3
WP 2
WP 1
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Editing Routes
WP 4

• 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

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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
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WP 3
On your nautical chart, stick small labels showing the Waypoint Number beside each WPT.
Measure, plot, and label your course lines. Update your Trip Log.
Determine the LAT/LON for each Waypoint and establish Waypoints in your GPS.
Establish a XTE safety zone
C 225 D 2.4
WP 2
C 224 D 3.1
WP 1
ANIMATION
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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
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GPS Route Page Display

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

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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.

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Alarm Sounds
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Any questions about

• AV Task 6-5 How routes are created and used by
  GPS page 143.