Source: Admiralty Chart 2888 (thumbnail image), title: Jask to Dubayy and Jazireh-Ye Qeshm, area: “Iran, Oman, and the United Arab Emirates,” chart scale: 1:350,000 (UKHO: United Kingdom Hydrographic Office, Taunton, Somerset, “March 29 1985 edition,” “printed with corrections in 1988”).
By CJHjr: Cut and moved the vertical scales and the bottom horizontal scale (but not the top horizontal scale), in order to frame this section of the chart.
Measurements: On a nautical chart, one nautical mile is one minute of latitude. The further you are from the equator the further apart be the latitude marks, on the vertical/latitude scale. And I don’t exactly remember why (at the moment). Because the earth is a squashed sphere? Because the Mercator Projection pretends the vertical lines of longitude are parallel (they get very far apart, the closer you are to the poles). But whatever be the reason, if you are north of the equator, for example, as here, the distance between the marks at the top of the chart, on the vertical/latitude scale, are greater than at the bottom of the chart. This far from the poles, the difference is not obvious. Hence, the most accurate you can be, is to use the marks, on the vertical/latitude scale, at the actual latitude where you want to measure something.
© Crown Copyright 1985.
Charles Judson Harwood Jr.
Posted August 10 2004. Updated August 13 2008.
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