Tenino Map Practical
Application
1.
2.
3.
4.
5.
6.
Recognize Terrain Features
Measure Distance (Straight Line & Road)
Read Grid Coordinates
Determine Elevation
Convert Magnetic Azimuth
Find Unknown Location by Resection
Note Grid Lines
(Read Right and up)
Read up = 78
Note Meter Scale
Note Miles Scale
Read Right = 15
Note Contour Interval
Note G-M Angle
Note Map Number
Back Azimuth =
Add or Subtract
180
Practical Exercise #1
1. Recognize Terrain Feature (Hill Top)
2. Identify Grid Square
• Look at the lower left hand corner of your
map, and locate Hill Top 192.
• What grid square is Hill Top 192 located
in?
Answer
How many of you had: EG0279 ?
(If you forgot the “EG”, your answer
is incorrect.)
Determine Eight-Digit
Grid Coordinates
(Note Position of Protractor)
Practical Exercise # 2
Find Eight-Digit Grid Coordinates
• What are the Eight Digit Grid Coordinates
for Hill Top 192?
Answer
• How many of you came up with
EG 02457910 ?
Practical Exercise #3
Identify Terrain Feature
• What natural terrain feature is at
grid coordinate EG06109015?
Answer
• Depression
Practical Exercise #4
Identify Terrain Feature
• Locate north/south grid line 15 at the bottom of
your map.
• Follow it up six grid squares.
• What man-made Terrain Feature do you see in
this grid square? (Remember: Read Right & Up)
Answer
• How many have “Mine or
Quarry”?
Practical Exercise #5
Determine Eight-Digit Grid Coordinates
• What are the eight-digit grid coordinates of
the mine or quarry you have just located?
Answer
• How many have EG15818215?
Measure Straight-line Distance
Match tick marks on paper
strip against map scale.
Practical Exercise #6
Measure Straight-line
Distance in Meters
• What is the straight-line distance in meters
between the water tower in grid square
EG11558558 and the oil tank in grid
square EG08359360?
Answer
• How many have 8,630 meters?
(+/- 100 Meters)
Practical Exercise #7
Measure Straight Line
Distance in Miles
• What is the distance in miles
between those same two points?
(Use “Statute” Miles Scale, not “Nautical” Miles Scale)
Answer
• 5.4 Statute Miles (+/- .10 miles)
Measuring Curved Line Distance
(As with Roads)
Move and change angle of
paper strip, as you move
along road.
Practical Exercise #8
Measure Road Distance
• What is the road distance in meters
between the river bridge in grid square
EG10408840, southwest to the road
junction in grid square EG03108525, at
the Church of God?
Answer
• 8,000 meters (+/- 100 meters)
Determine Elevation
Locate point on the map
Determine contour interval of map
Locate index contour line nearest point
Count number of contour lines up or down that must be crossed to get to point
Points at top of hill add half the contour interval
Points at bottom of depression subtract half the contour interval
Practical Exercise #9
1. Recognize Natural Terrain
Feature
2. Determine Elevation
• What type of natural terrain feature is at
grid coordinate EG16107925? (Look closely,
before identifying)
• What is its height in meters?
Answers
• Saddle
• 150 meters (+/- 10 meters)
(Did you remember what the contour
interval is on the Tenino Map?)
Practical Exercise #10
1. Recognize a Natural Terrain
Feature
2. Determine Elevation
• What natural feature is found at grid
coordinate EG17078440
• What is its elevation in meters?
Answers
• Hill Top
• 310 Meters
Convert Magnetic Azimuth
Check Here on Your Tenino
Map for GM Angle
Instructions
Practical Exercise #11
1. Convert Magnetic Azimuth
2. Determine Eight-Digit Grid Coordinates
3. Measure Straight line distance
4. Recognize Manmade Feature
• An observer at the Crawford Mountain Lookout
Tower, in grid square EG1887 sees a convoy
parked on a light duty road. The magnetic
azimuth from his position to the convoy is 260
degrees, a distance of 15,820 meters. What is
the eight-digit coordinate of the convoy.
Answer
• EG02509065
(+/- 50 meters)
(+50 meters = EG02559070)
( -50 meters = EG02459060)
Practical Exercise #12
1. Convert Magnetic Azimuth
2. Find Unknown Location.
• You are at the church of God in grid
square EG0385 and observe an
automobile accident on Interstate 5. The
magnetic azimuth from your position to the
cars is 331 degrees. What is the eightdigit coordinate of the accident?
Answer
• EG02329010
(+/- 50 meters)
(+ 50 meters = EG23379015)
(- 50 meters = EG02279005)
Determine Unknown Location on
Ground by Resection
Step 1: Identify Two Or Three Distant Locations on
the Ground and Mark them on the Map
Step 2: Shoot a Magnetic Azimuth to the Distant
Locations
Step 3: Convert the Magnetic Azimuths to Grid
Azimuths
Step 4: Compute the Back Azimuths
Remember:
a. If Converted Grid Azimuth is less than 180 , add 180 .
b. If Converted Grid Azimuth is more than 180, subtract 180
Practical Exercise #13
. Locate Unknown Point on
1
Ground by Resection
• You are trying to determine your unknown
location. You determine the magnetic azimuth to
TV relay tower in grid square EG1287 to be 204
degrees and the magnetic azimuth to Crawford
Mountain Lookout Tower in grid square EG1887
to be 129 degrees. What is your location to the
nearest 50 meters?
Answer
• EG15859120
(+/- 50 meters)
+ 50 meters = EG15909125
- 50 meters = EG15809115
(Did you remember to first add the G-M
Angle, and then subtract or add 180
degrees?)
Practical Exercise #14
1.
2.
3.
4.
Identify Manmade Feature
Convert Magnetic Azimuth
Measure Straight Line Distance
Determine Grid Coordinates
• What manmade feature is on a magnetic
azimuth of 119 degrees at a distance of
5,700 meters from bench mark 86 in grid
square EG0589?
Answer
• Water tank (EG09358529)
QUESTIONS?