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note plyr

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commit 721889c198995df98852c861aa78c2819332cb40 1 parent a7b88f6
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6 README.md
@@ -16,4 +16,8 @@ The script breaks up data into groups (voyage) by three criteria:
* Logbook changes. Different logbooks are noted for individual ships. A change in the logbook is a potential indicator that a new voyage has started
* Large time differences. Within the same logbook if a ship spends more than 30 days without a log entry we can imagine that a new voyage is started.
-* Distance discontinuities. Some of the records jump large distances (great circle) in a day or two. Sometimes this may be from a transcription error and other times it may be because a logbook was transferred. In either case it would break up a chart were we to connect the lines.
+* Distance discontinuities. Some of the records jump large distances (great circle) in a day or two. Sometimes this may be from a transcription error and other times it may be because a logbook was transferred. In either case it would break up a chart were we to connect the lines.
+
+## Dependencies
+
+The script only depends on **plyr** for setting up the distance computation. Because we're using the raw text and not the Access db we don't need to introduce any time sensitive dependencies.
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