Your companion has fallen on a scree slope and cannot walk. You have a signal for the first time in an hour. The call handler asks, "Where are you?" You could say "on the path up from the lake, about halfway". Or you could say "Sierra Hotel, six zero three, five four eight; on the east side of the path, below a small crag, two of us, one in a…
In this lesson
The OS National Grid
Four-figure references: the 1 km square
Six-figure references: the 100 m square
Worked example
The romer
Eight- and ten-figure references
Latitude and longitude
UTM: the worldwide metric grid
MGRS references
Datums: why the same numbers can be in two places
Giving your location to rescuers
Check yourself
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The rest of this lesson is in the full course
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