Concept of Geographic coordinate systems and map projections.
And then you get a map with no coordinate grid....
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Transcript of And then you get a map with no coordinate grid....
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And then you get a mapwith no coordinate grid...
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MidPen OSP Map
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North Direction
Distance Scale
Coordinates of aknown location
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Important Information...
•A map of the area with...–North Reference–Distance Scale
•Coordinates for a known location–It’s quick and easy to save the location of the trailhead where you parked, in your GPS.
–Coordinates marked on the map can be entered into your GPS.
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Use the GOTO feature on your GPS
•Your GPS will give you a bearing and distance to the stored location, from your current location.
•But it’s our current location that we want to know!
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•Plot the bearingbackwards from thestored location.
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GPS --> Stored Location
40° True, 1.2 miles- Place your protractor on the stored location.
- Align 0° on the protractor with
North on the map.Pay attention to the maps north reference,
and to the GPS’s north reference
set in the Headings setup page.
- Mark the bearing at the edgeof the protractor.
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•Use the 1 mile scale barand the edge of a piece of paper,to mark a 1.2 mile distance.
GPS --> Stored Location
40° True, 1.2 miles
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•Line the edge of the paper upwith the stored location and themark you made at the edge of the protractor.
•Measure backwards along thebearing line for 1.2 miles.
GPS --> Stored Location
40° True, 1.2 miles
You are here!
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•Using a bearing and distance from a second known location will confirm your location and protect you from errors you may have made plotting the first one.
•Let’s try it out...
Siera Azul Map
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Use the protractor on your grid tool
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