Brunton QuadTool User Manual

Using your
Latitude-Longitude
Latitude-Longitude
(lat./long.) is a spherical
coordinate system. A position on Earth is mea-
sured in degrees ( ), minutes ( ' ) and seconds
o
( " ), and starts from 0 latitude (Equator) and 0
o
longitude (Prime Meridian).
For GPS receiver use, identify the map datum at
the lower-left corner on the map, (Figure 1).
Map Datum Designation (Figure 1)
Map datums were created because the Earth is
not a perfect sphere and corrections for mapping
are needed. When using a map with no map
datum identified use World Geodetic System
1984 (WGS-84) map datum.
All USGS topographic maps are bound by 7.5
minutes of latitude and longitude, and each cor-
ner is identified in lat./long. Latitude-longitude
tick marks are positioned every 2'30" around the
map (Figure 2). The crosses in the center of the
map indicate intersection points.
All of the examples use a 1:24,000 scale, USGS,
topographic map and the QUAD TOOL .
Range and Township Grid Tool
Distance Scale - Mile
QUAD TOOL
QUAD TOOL
Find positions in:
Universal Transverse Mercator (UTM)
"
Latitude & Longitude
"
Range & Township
"
Plot distance in:
Meters
"
Kilometers
"
Feet
"
Miles
"
SIMPLE
QUAD TOOL
UNITED STATES
DEPARTMENT OF THE INTERIOR
GEOLOGICAL SURVEY
109˚07'30"
42˚45'
o
42'30"
40'
N
42˚37'30"
109˚07'30"
USGS Topographic Map (Figure 2)
Latitude-Longitude Positioning
1. Document map datum.
· 1927 North American Datum (NAD-27us)
(Figure 1)
2. Identify the black lat./long. tick marks, and
draw lines connecting equal value ticks to pro-
duce 9 small rectangles (Figure 2).
3. Mark position with an "X".
4. Place the lat./long. scale vertically so its "0" is
at the bottom of one of the rectangles
and next to the "X" (Figure 3)
5. At the "X", add the scale value (1' 23") to the
line at the latitude line (42
· Add values similar to time on a clock.
42 ° 42' 30"
+ 01' 23"
42 ° 43' 53" = 42
©
©
ACCURATE
!
©
SWEETWATER GAP QUADRANGLE
WYOMING
7.5 MINUTE SERIES (TOPOGRAPHIC)
5' 2'30" 109˚00'
42˚45'
42'30"
40'
42˚37'30"
5' 2'30" 109˚00'
° 42' 30").
° ° 43' 53" N. Latitude
Slope Angle
Latitude/Longitude Scale
The indispensable link between
map, compass and GPS.
The indispensable link between
map, compass and GPS.
Compute slope steepness for:
Route Finding
"
Avalanche Prediction
"
20, 40 or 80-foot Contours
"
For USGS 7.5 minute series,
1:24,000 scale only.
Printed on flexible, sturdy plastic with
protective no-glare finish. 7.6" x 1.7"
COMPACT
!
BRUNTON

For use with 1:24,000 scale maps.
°
42 45'00"
°
42 42'30"
Latitude Measurement (Figure 3)
6. Tilt lat./long. scale to the left until its "0" is at
the right, and its 2'30" touches the left side of
the rectangle (Figure 4, pg. 2).
7. Slide scale up or down until it lies next to the
"X" (Figure 4).
8. At the "X", add the scale value (1' 01") to the
lowest longitude value (109
step # 5 above.
9. Longitude = 109 ° ° 06' 01" W. Longitude
Final Lat. / Long. Coordinate is:
° °
42 43' 53" N. Lat..
° °
109 06' 01" W. Long.
Set GPS to NAD-27us map datum before enter-
ing coordinate.
UTM Tool / Metric Scale
Teton County Search and Rescue.
FIELD EFFECTIVE
!
QUAD TOOL
1'23"
° 05' 00"), same as
Field tested by
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