Advanced GPS Course - Eastern Shore Ground Search and Rescue

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Transcript Advanced GPS Course - Eastern Shore Ground Search and Rescue

EASTERN SHORE GROUND
SEARCH AND RESCUE
PRESENTS
ADVANCED
GPS COURSE #1
NOTE ON GPS USE
GPS enhances, not replaces
traditional map and compass
navigation.
NOTE ON CLASS EXAMPLES
Classroom examples are based on the Garmin
GPSMAP60 and GPSMAP76.
Team units will be provided for use during class.
COURSE PREREQUISITE
►
To benefit from this course, you should be very
comfortable with the material covered by our
BASIC GPS COURSE.
►
All are welcome to attend, however, this course
will not teach basic GPS use.
►
If you require basic GPS instruction, please
attend one of our basic courses.
TOPICS
1.
2.
3.
Measuring distances
Projecting waypoints
Techniques for following bearings
MEASURING DISTANCE
►
The GPS map page can be used for more than
viewing your course of travel.
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The GPS map page can be used to measure:
 Distance between the user and a point on the map
 Distance between two points on the map
DISTANCE FROM USER
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To start measuring distance, select the Map
page and:
1. Press the “MENU” button.
2. Select “Measure distance”.
3. Move the pointer to the position to measure to.
4. Distance from user is shown at top right of screen.
5. Press “QUIT” to stop measuring.
DISTANCE BETWEEN POINTS
►
To start measuring distance, select the Map
page and:
1. Press the “MENU” button.
2. Select “Measure distance”.
3. Move the pointer to the starting point and press
“ENTER”. A pin is placed at this point.
4. Move pointer to the end point. Distance between
points is shown at top right.
DISTANCE BETWEEN POINTS
MEASURING EXERCISE
A) Using only the GPS map page, measure the distance from the
Hall to the start of Tower Road (across the highway and just
East of the Hall).
B) Using only the GPS map page, measure the length of Tower
Road.
MEASURING EXERCISE
ANSWERS
A) Hall to Bottom of Tower Rd: ~ 180 meters
B) Length of Tower Road: ~ 350 meters
PROJECTING A WAYPOINT
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A projected waypoint is a waypoint that is
created based on the distance and bearing from
an existing waypoint.
►
Projected waypoint = bearing + distance from
an existing waypoint.
PROJECTING A WAYPOINT
Instruct GPS to create
(project) a waypoint for
the position of the injured
searcher:
1. Use Team1’s position as
starting point.
2. Enter bearing to injured
searcher.
3. Enter distance to
injured searcher.
4. Projected waypoint is
created.
Team 1
497345 5927123
Team 2:
Injured searcher
497500 5927801
PROJECTING A WAYPOINT
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Uses for projecting waypoints:
• Travel to locations given only distance and bearing.
• Useful during a grid search to stay on bearing.
• Useful to re-gain bearing after going around large
objects.
• Another tool a Team Leader can employ while on a
tasking.
1.
Select or
mark
waypoint.
Press
Menu,
choose
Project
Waypoint.
4.
Name
projected
waypoint.
2.
3.
Enter
distance.
Enter
magnetic
bearing.
5.
Click OK
to save
original
waypoint
if Mark
pressed
in #1.
Example of projecting a waypoint
PROJECTING A WAYPOINT EXERCISE
A) The flagpole of the elementary school in Porter’s Lake is located
2.12 km on a bearing of 300 degrees magnetic from the ESGSAR
Hall. What are the coordinates for the flagpole?
B) The Sobey’s in Jeddore is 13.6 km from the ESGSAR Hall on a
bearing of 91 degree magnetic. What are the coordinates for
Sobey’s?
PROJECTING A WAYPOINT EXERCISE
ANSWERS
A) FLAGPOLE:
477733 E 4954619 N
B) SOBEY’S:
492731 E 4958430 N
FOLLOWING BEARINGS
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The Basic GPS course teaches you how to
navigate to a waypoint by taking the most
efficient route.
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In most cases, the most efficient route is NOT a
straight line.
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Taking the most efficient route usually involves
avoiding swamps, creeks, ponds, bogs, etc.
FOLLOWING BEARINGS
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When one is required to follow a bearing (to
travel in a straight line), following the most
efficient route is often not possible.
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The required method for following a bearing is
to use a magnetic compass.
FOLLOWING BEARINGS
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Given typical woods in our search area,
following a bearing with a high degree of
accuracy can be very challenging.
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A GPS can be used in conjunction with a
compass to minimize drifting off a bearing.
FOLLOWING BEARINGS
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These GPS functions can assist with following a
bearing:
 Compass Pointer: Can indicate if the user has drifted
left or right of a bearing.
 Compass “Off Course” field: Displays the distance
in meters one has drifted from a bearing.
 Map “Go To” line: Can be configured to show the
user’s location in relation to a bearing.
BEARING POINTER
A red arrow points in the direction of the waypoint. This is
the default setting for our GPS units.
BEARING POINTER EXAMPLE
0
90
270
180
Walking directly towards the waypoint. No
information is displayed about your original
bearing.
COURSE POINTER
A red arrow points in the direction of the waypoint. The
middle section of the arrow separates to indicate your
original bearing line.
COURSE POINTER EXAMPLE
20
Off course
0
90
270
180
Walking directly towards the waypoint. Need
to walk 20 meters to the right to return to the
original bearing.
COURSE POINTER EXAMPLE
45
Off course
0
90
270
180
Need to rotate to the right to face the waypoint and then
walk 45 meters to the left to return to the original
bearing.
COMPASS POINTER SETUP
►
To switch between compass bearing and course
pointers, start on the Compass page and:
1) Press the “MENU” button.
2) Select “Bearing Pointer” or “Course Pointer”.
3) Press the “ENTER” button.
MAP GO TO LINES
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By default, when navigating to a waypoint, the
purple “Go To” line extends from your position
to the waypoint.
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To aid in following a bearing, the “Go To” line
can remain attached to your starting position.
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With the “Go To” line attached to the starting
point, it is very easy to see if you are drifting
away from your bearing.
BEARING GO TO LINE
WAYPOINT
Go To line remains
attached to you. This is
the default setting.
COURSE GO TO LINE
WAYPOINT
Go To line remains
attached to the starting
point. Easy to see “drift”.
GOTO LINE SETUP
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To switch between map bearing and course
“Go To” lines, start on the Map page and:
1) Press the “MENU” button and select “Setup Map”.
Press the “ENTER” button.
2) Scroll left or right until “Map Setup – Tracks” is
selected.
3) Scroll down to the “Go To Line” field and select
“Course” or “Bearing”.
4) Press the “ENTER” button.
GOTO LINE SETUP
USING GPS WITH BEARINGS
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Turn on Map page’s “Course” goto line.
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Turn on Compass page’s “Course” pointer.
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Before starting off on a bearing, enter end point
as a waypoint and set GPS to GOTO it.
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Use map and compass pages to determine drift
and advise the compass person how to adjust
the line of travel.
USING GPS WITH BEARINGS
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If there is no defined end waypoint – as in a grid
search:
 Project a waypoint beyond the distance of the grid
boundary and set the GPS to GOTO it.
•
For example, if the grid is 300 meters long, project a
waypoint for 300 or more meters.
 Project a new waypoint each time you line up to
start a new line through the search grid.
FOLLOWING A BEARING EXERCISE
1. Enter a waypoint for the Superstore at Porters Lake:
477703 E 4954479 N
2. Set your GPS’ map and compass screens to the COURSE
pointers. Set the map page zoom level to 50 or less.
3. Stand at the flagged stake at the back of the hall parking lot
and follow the instructions on the “Following a Bearing
Exercise” handout.
QUESTIONS
AND COMMENTS
END OF COURSE
THANK-YOU FOR ATTENDING