Session 10ROUTES

A waypoint A waypoint

(WPT or WP) (WPT or WP)

is a designatedis a designated

location withlocation with

geographicgeographic

coordinates.coordinates.

A group of A group of waypoints, linked waypoints, linked

together in a together in a logical sequence logical sequence

on a GPS, is on a GPS, is called a “called a “routeroute.”.”

Entering WaypointsEntering WaypointsEnter 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 PageGPS Position Page

TimeTime

Direction bar at

top of screen.

Course and Speed

Mileage and Altitude

Position

This is not a compass reading!

Waypoint List

Waypoint List: 0020 Name: __________________________ 0016 42 12.06 N 070 41.90 W 0017 42 05.62 N 070 36.40 W 0018 41 55.10 N 070 30.40 W 0019 41 46.12 N 070 28.75 W 0020 ** **.** N *** **.** W 0021 42 19.60 N 071 00.10 W 0022 ** **.** N *** **.** W 0023 ** **.** N *** **.** W

Set Up Waypoint

Set up waypoint: ________________________ Display position as: LAT/LON 0020 42 16.50 N 071 39.55 W

A simple

waypoint

entry screen

Verifying your present Verifying your present position as a waypointposition as a waypoint

Use a simple numbering system.

Do not place your position on top of the Aid. Risk of collision!

Validate every waypoint beforeusing it as a permanent waypointin a route.

WPT 1 WPT 2

WPT 3

WPT 4

WaypointsWaypoints are used extensively in are used extensively in GPS navigation:GPS navigation:• As boundaries between As boundaries between

voyage segments – LEGS. voyage segments – LEGS.

• To mark turning points, To mark turning points, destinations, and aids to destinations, and aids to navigation.navigation.

• To mark hazards to navigation.To mark hazards to navigation.

Waypoint UseWaypoint Use

Mark the Mark the boundaries boundaries

between legs.between legs.

WPT 1 WPT 2

WPT 3

WPT 4Marks the turn in a channel

RockMarks hazards to navigation or obstructions.

GPS receivers enable waypoints to be GPS receivers enable waypoints to be entered and stored in various ways.entered and stored in various ways.

A sequence of waypoints can define a A sequence of waypoints can define a planned route.planned route.

Most GPS receivers store routes as well Most GPS receivers store routes as well as waypoints.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?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 RoutesEditing Routes• GPS receivers should allow you to GPS receivers should allow you to

delete, move, or append delete, move, or append waypoints.waypoints.

• In this case:In this case:

WPT 2 will be deleted and moved.WPT 2 will be deleted and moved.

WPT 3 will be changed.WPT 3 will be changed.

WPT 4 will be added.WPT 4 will be added.

WPT 2

WPT 3

WPT 1

WP 4

WPT 2

WPT 3WPT 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 NavigationROUTE Navigation

WPT 1

WPT 2

C 224

D 3.1

C 225

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.

Waypoint Listing TRUE Meas'd GPS Latitude Longitude

WPT RTE LL No. Description HDG HDG Dist Dist Deg M ins Deg M ins Type of Mark Date

001 1 Float at Dorchester Yacht Club Start 042 18.310 N 071 03.130 W Dock

003 1 Morrissey Blvd Bridge 112 0.239 042 18.220 N 071 02.830 W Outer Bridge Pier - South 10-Jun-01

004 1 11230 Dor. Bay Lighted Buoy 12 069 0.704 042 18.470 N 071 01.940 W Lighted Red Buoy 10-Jun-01

005 1 11210 Dor. Bay Lighted Buoy 5 041 0.764 042 19.050 N 071 01.267 W Lighted Green Buoy 10-Jun-01

006 1 11200 Dor. Bay Buoy 3 065 0.931 042 19.450 N 071 00.130 W Green Can 10-Jun-01

007 1 11579 Western Way Buoy 9 126 0.392 042 19.220 N 070 59.700 W Green Can 10-Jun-01

008 1 Right Pier Long Island Bridge 137 0.856 042 18.520 N 070 58.820 W Right Pier of Bridge 10-Jun-01

009 1 11554 Western Way Lighted Buoy 4 139 0.993 042 17.770 N 070 57.940 W Lighted Red Buoy 10-Jun-01

010 1 11514 Peddocks Is, Channel Buoy 2P 073 0.580 042 17.940 N 070 57.190 W Red Nun 10-Jun-01

011 1 11395 Nantasket Rds Lighted Buoy 11 064 1.638 042 18.660 N 070 55.200 W Lighted Green Buoy Fl G 2.5s 10-Jun-01

012 1 11370 Nantasket Rds Lighted Buoy 9 058 0.596 042 18.980 N 070 54.520 W Green Buoy 10-Jun-01

013 1 11355 Nantasket Roads Lighted Buoy 3 086 1.298 042 19.080 N 070 52.770 W Green Buoy 10-Jun-01

014 1 00435 Harding Ledge Lighted Bell Buoy 1HL 109 1.700 042 18.520 N 070 50.600 W Lighted Green Buoy Fl G 4s 10-Jun-01

015 1 00445 Davis Ledge Lighted Gong Buoy 1DL 118 4.765 042 16.300 N 070 44.900 W Green Buoy

N W

016 1 12258 Scituate Approach Lighted Gong Buoy SA 152 4.751 042 12.100 N 070 41.900 W Red and White Stripes

017 1 12490 Farnum Rock Lighted Bell Buoy 6 148 7.656 042 05.620 N 070 36.400 W Red Buoy

018 1 13035 Mary Ann Rocks Lighted Whistle Buoy 12 157 11.426 041 55.100 N 070 30.400 W Red Buoy

019 1 13065 Cape Cod Canal Entrance Buoy 7 176 8.521 041 46.600 N 070 29.600 W Red Buoy

TOTAL ROUTE 47.810

020 13090 Barnstable Harbor Entrance Lighted Bell BH 099 N W Red and White Stripes

021 2 11195 Dorchester Bay Buoy 2 042 19.600 N 071 00.100 W Red Nun

022 2 10875 Boston Main Channel Lighted Buoy 3 061 042 19.540 N 071 59.300 W Green Buoy

023 2 10790 Nixes Mate Lighted Bell Buoy 15 080 N W Green Buoy

024 2 10768 South Channel Lighted Buoy 10 064 042 20.73 N N 070 55.12 WW Red Buoy

025 2 10740 South Channel Entrance Buoy 1 042 042 21.900 N 070 53.800 W Green Buoy

026 2 00410 Boston Lighted Horn Buoy B 048 042 22.700 N 070 47.000 W

027 3 10735 North Channel PR Junction Buoy PR 042 20.500 N 070 56.200 W

028 3 10390 North Channel Lighted Buoy 3 028 042 21.900 N 070 55.200 W Green Buoy

029 3 10680 North Channel Entrance Lighted Whistle Buoy NC047 042 22.500 N 070 54.300 W Red and White Stripes

030 3 Outer Breakers Fl r 4s Bell "4" 031 042 27.600 N 070 50.300 W Red Buoy

031 3 10410 Tinkers Rock Gong Buoy TR 038 042 28.900 N 070 48.900 W

032 3 10430 Marblehead Channel Buoy 1 335 Green Can

033 10560 Nahant Rock Buoy 1 Green Can

034

035 4 Fl R #10 Lighted Buoy Main Ship Chan. 042 20.69 N 071 00.70 W Recheck position

036 4 Can #5 Small Boat Channel 042 20.48 N 070 59.940 W Green can

037 4 Nun #4 Small Boat Channel 042 20.46 N 070 59.61 W Red Nun

038

039

040

041

042

043 Fl R #10 Main Ship Channel 042 20.69 N 071 00.70 W Red Lighted Buoy.

044

ROUTE PLC01

005 Start 11210 FL G 5 Dorchester Bay 42-19.050 71-01.267

006 1 11200 Can 3 Dorchester Bay 065 0.930 0.900 42-19.450 71-00.130

007 2 11579 Can 9 Western Way 126 0.392 0.400 42-19.220 70-59.700

021 3 11564 Nun 6 Western Way 134 1.210 1.200 42-18.400 70-58.567

022 4 11477 Nun 4 Bass Point 057 0.683 0.700 42-18.775 70-57.783

023 5 11475 Can 3 Rainsford Is. 073 0.383 0.400 42-18.883 70-57.300

024 6 11470 Can 1 Hosp Shoals 078 0.750 0.700 42-19.033 70-56.317

025 7 11504 Can HS Hosp Shoals 170 0.300 0.300 42-18.750 70-56.250

026 8 11524 Can 5P Peddocks Is 208 1.450 1.500 42-17.450 40-57.183

Highway Page on GPS

Added line showing vessel direction 095º T

Difference between line andthe 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 AlarmArrival AlarmSounds whenever theboat penetrates anadjustable ring around awaypoint.

Initiates new headingdata for the next leg inyour route.

Note that waypoint ispositioned just off theATON not on top of it.

Alarm SoundsAlarm Sounds

1/2 M1/2 M

Course and Speed Display

213 deg.

23.4 kn

Shows:

Course – magnetic or true

SOG in knots.

MAN OVERBOARD _________________________________________________

C 241 B113 DIST 1.89 nm TIME 8 min MOB 42 41.56N POS 071 01.44W

If someone falls overboard, press the MOB key. Display shows:

Present course of your boat.

Bearing to person in water.

Distance to person in water.

Elapsed Time in minutes. Position of MOB.

Estimated Time of Arrival (ETA_

ETA: Arrival Time 08:41 Date: 08:03:2002

ETA mode: MANUAL ETA speed: 10.0 kn

AVN: Velocity: 12.5kn

Planned arrival time: 07:20 Date: 08:03:2002 _________________________________________ WP: 003

ETA refers to an inserted local time. AVN—Approximate Velocity Necessary is automatically calculated in knots after you enter the ETA data.

Any questions about:

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