Transcript Coastal Navigation using GPS

WAYPOINTS
Use the “View Notes
Page” to review this
presentation.
GPS Tips
Periodically verify your GPS
location by using other methods.
Use Aids to navigation as waypoints.
Stay alert for GPS malfunctions.
Waypoint Screen
Waypoint
name
Reference
waypoint
Bearing from
reference
waypoint
Position
coordinates
Waypoint
comment
Distance from
reference
waypoint
1. Learn how to
input waypoints.
2. Learn how to
use waypoints.
A “WAYPOINT”
(WPT or WP)
is a designated
location with
geographic
coordinates defined by
latitude and longitude.
Source of Waypoints
INPUT TO YOUR GPS:
Deg. Min. Sec.
41 10 00.000 N
070 40 00.000W
latitude
longitude
What is the fixed location of lighted buoy G “1B1” Fl G 4 sec
BELL, located just north of Sandy Point on Block Island?
INPUT TO YOUR GPS:
Deg. Min. Sec.
41 15 30.000 N
071 34 30.000 W
Latitude: 41º 15.5’ N
Longitude: 71º 34.5’ W
ANIMATION
GPS Tips
Don’t be afraid to place
Waypoints on the charted
location of an Aid to Navigation.
The odds are that it won’t
actually be there due to its
Watch circle and natural
influences.
GPS Tips
*Use a minimum
number of characters to
define a waypoint.
*Maintain an EXCEL list of
waypoints for reference.
Light List
48 10 54 N
123 06 37 W
Waypoint Listing
WPT RTE LL No. Description
001
1
Float at Dorchester Yacht Club
003
1
Morrissey Blvd Bridge
004
1
11230 Dor. Bay Lighted Buoy 12
005
1
11210 Dor. Bay Lighted Buoy 5
006
1
11200 Dor. Bay Buoy 3
007
1
11579 Western Way Buoy 9
008
1
Right Pier Long Island Bridge
009
1
11554 Western Way Lighted Buoy 4
010
1
11514 Peddocks Is, Channel Buoy 2P
011
1
11395 Nantasket Rds Lighted Buoy 11
012
1
11370 Nantasket Rds Lighted Buoy 9
013
1
11355 Nantasket Roads Lighted Buoy 3
014
1
00435 Harding Ledge Lighted Bell Buoy 1HL
015
1
00445 Davis Ledge Lighted Gong Buoy 1DL
TRUE
Meas'd
Dist.
GPS
Latitude
Longitude
HDG
HDG
nm
Dist
Deg
Deg
Start
112
069
041
065
126
137
139
073
064
058
086
109
118
0.239
0.704
0.764
0.931
0.392
0.856
0.993
0.580
1.638
0.596
1.298
1.700
4.765
M ins
1
12258 Scituate Approach Lighted Gong Buoy SA
017
1
12490 Farnum Rock Lighted Bell Buoy 6
018
1
13035 Mary Ann Rocks Lighted Whistle Buoy 12
019
1
13065 Cape Cod Canal Entrance Buoy 7
152
148
157
176
4.751
7.656
11.426
8.521
Date
042 18.310 N
071 03.130 W Dock
042 18.220 N
071 02.830 W Outer Bridge Pier - South
10-Jun-01
042 18.470 N
071 01.940 W Lighted Red Buoy
10-Jun-01
042 19.050 N
071 01.267 W Lighted Green Buoy
10-Jun-01
042 19.450 N
071 00.130 W Green Can
10-Jun-01
042 19.220 N
070 59.700 W Green Can
10-Jun-01
042 18.520 N
070 58.820 W Right Pier of Bridge
10-Jun-01
042 17.770 N
070 57.940 W Lighted Red Buoy
10-Jun-01
042 17.940 N
070 57.190 W Red Nun
10-Jun-01
042 18.660 N
070 55.200 W Lighted Green Buoy Fl G 2.5s
10-Jun-01
042 18.980 N
070 54.520 W Green Buoy
10-Jun-01
042 19.080 N
070 52.770 W Green Buoy
10-Jun-01
042 18.520 N
070 50.600 W Lighted Green Buoy Fl G 4s
10-Jun-01
042 16.300 N
070 44.900 W Green Buoy
N
016
Type of Mark
M ins
W
042 12.100 N
070 41.900 W Red and White Stripes
042 05.620 N
070 36.400 W Red Buoy
041 55.100 N
070 30.400 W Red Buoy
041 46.600 N
070 29.600 W Red Buoy
AUse
great
tool to use
when numbering
you validate your
a simple
waypoint
waypoints.
EXCELtoprovides
a more extensive
system
identify waypoints
and
media
for a on
waypoint
list screen.
than your
avoid
clutter
your
GPS
Your EXCEL Waypoint
listing
can
serve
as
GPS set.
001, 002,
003,when
004, your
etc. GPS fails.
a i.e.
backup
system
You need to learn how to:
• Store present positions.
• Enter a position.
• Rename, edit, and
copy waypoints.
• Create and edit routes.
• Delete waypoints and routes.
Entering Waypoints
Waypoint
name
Reference
waypoint
Bearing from
reference
waypoint
Position
coordinates
Waypoint
comment
Distance from
reference
waypoint
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
Always pre-plot all waypoints on a
nautical chart and measure the
distance and bearing between
waypoints.
• Verify on your chart that the trip
legs are planned in safe water.
• Record the data on a Trip Log.
• 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.
• Select waypoints that can be
easily verified by other methods-visual fixes, soundings, radar,
etc.
NEVER rely on one
means of navigation.
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
Inserts WPT here
Set Up Waypoint
Set up waypoint:
________________________
Display position as:
0020
LAT/LON
42 16.50 N
071 39.55 W
A simple
waypoint
entry screen
Scrolling on the Map Page
Use the cursor key
Scroll to specific coordinates or
To a course & distance or
Scroll to object on screen (if any)
Tip of arrow shows scroll
position
Current position
The Waypoint Screen
Press “Mark” (enter key twice)
Bring up waypoint screen
Change name if desired
Date & time shown
Coordinates shown
Scroll to “OK” & press “Enter”
to store waypoint
GPS Tips
• Waypoints do not have to be
located in the water.
• Waypoints can be used to mark
hazards to navigation--areas to
avoid and areas to visit.
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.
Verifying your planned
positions as a waypoint
• Use a simple numbering system.
• Validate every waypoint before
using it as a permanent waypoint
in a route.
WPT 1
WPT 4
WPT 3
WPT 2
Verifying your Waypoint
Press the “Mark” button
Brings up Waypoint
Screen
Waypoint Use
Mark
the
Marks
the to
Marks hazards
boundaries
navigation
turns in aor
between
legs.
obstructions.
channel
WPT 1
Rock
WPT 4
WPT 3
WPT 2
NAVIGATING
WITH WAYPOINTS
Using GPS
to Navigate
Identify waypoint locations
or the direction & distance
between them.
Using GPS
to Navigate
• Plan a series of waypoints.
• Check for obstacles between
them—shoals, rocks, islands.
• Check 1/4 mile either side of
your planned course for
obstacles.
GOTO Navigation
• Used by any boat in
open water to navigate
to a single waypoint.
• Useful functions:
– Range and Bearing
– Speed of Approach
– Turn
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
Course To Steer
• 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
Third Reef
On your nautical chart,
Determine the
Measure,
plot, labels
stick small
LAT/LON
for
and label
showing
the
Establish
a Waypoint
each
Waypoint
your
course
XTE safety
Number
beside each
and
establish
lines.
zone WPT.
Waypoints
Update
your in
your
GPS.
Trip
Log.
WP 3
WP 2
WP 1
ANIMATION
Plotting GPS Positions
• Check positions periodically so
that you will have a last known
position in the event of GPS
receiver failure.
• Always plot your trips on a
nautical chart.
• Always use a Trip Log.
GPS Tips
NEVER rely on any
one means of
navigation.
GPS Tips
• Use hand-held GPS units as backups
to ship-mounted units.
Carry extra batteries
• Always use conventional paper
charts with your GPS.
• 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 02
WPT 01
GPS Tips
Remember that the greatest
hazard to navigation may be
a bored navigator.