You wish to measure the distance on a...

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Question 1 of 2066636ee928f7522a1c51a744

You wish to measure the distance on a Mercator chart between a point in latitude 42°30'N and a point in latitude 40°30'N. To measure 30 miles at a time where should you set the points of the dividers to obtain the most accuracy?

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🔍 Key Concepts

• Mercator chart scale and how distance is measured using latitude • Why minutes of latitude on the central latitude between two points best represent the distance • Effect of using a latitude scale that is too far north or south from the segment you're measuring

💭 Think About

• First, find the total difference in latitude between 42°30'N and 40°30'N, then determine the mid-latitude between those two points. • Ask yourself: on a Mercator chart, does one minute of latitude equal one nautical mile anywhere, or is this only true along certain lines? • Which option places your divider points so they are centered as closely as possible on the mid‑latitude of the two positions you’re measuring between?

✅ Before You Answer

• Compute and note the mid-latitude between 42°30'N and 40°30'N before looking at the choices. • Check which answer choice’s latitude pair is symmetrical around, or at least closest to, that mid‑latitude. • Verify that you are using the latitude scale on the side of the chart nearest to where the track actually lies, not far away.

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