About that map
Sunday, July 27th, 2008I was talking to Scott the other day about the map. Specifically how much longer the distances traveled appear recently compared to earlier segments, and yet, how it doesn’t seem possible that Geraldine will finish the trip on time when looking at the map.
The answer to all these questions is that the map on the website is Mercator Projection of the world. It is often used because it accurately shows land shapes, and also shows compass headings as straight lines. On other types of maps, following a northwest course results in a curved line. Anyhow, the disadvantage of the Mercator Projection, is that it distorts the scale of land near the poles — the farther north and south you go, the more the map shows features larger than it should be compared to features at the equator.
To put that in context of the Northwest Passage, Greenland is not really as big as all of North America, it is only slightly larger than Mexico. So the farther north our adventurers travel, the more distance they will cover on the map each day (assuming they don’t slow down!). This will allow them to finish the trip on time!
For more on the Mercator Projection visit wikipedia:
http://en.wikipedia.org/wiki/Mercator_projection