At 0812 you obtain the following...

🔍 Key Concepts

• Bearing from your vessel vs. bearing from the aid – if Chesapeake Light bears 091°T from you, what is the reciprocal bearing from the Light to you? • Range and distance on a chart – 1 minute of latitude ≈ 1 nautical mile; use this to approximate distances between candidate positions and the Light. • Plotting or mentally checking bearing – how does changing longitude slightly east or west affect the bearing from Chesapeake Light to your position?

💭 Think About

• First, think about where your vessel must lie relative to Chesapeake Light if the Light bears 091°T from you. Are you generally north, south, east, or west of the Light? • Next, convert the 091°T bearing from your vessel to the Light into the approximate direction from the Light to you. Which general quadrant around the Light does that place you in? • Then, using the differences in latitude and longitude for each option, estimate which point is about 10.5 nm from Chesapeake Light and lies on that reciprocal bearing.

✅ Before You Answer

• Verify the reciprocal bearing (add or subtract 180°) to get the direction from Chesapeake Light to your vessel. • Check that the chosen option is roughly 10.5 nm from Chesapeake Light using latitude differences (1' ≈ 1 nm) and adjusting longitude with cos(latitude) if you want more accuracy. • Confirm that the latitude and longitude changes for your choice put you in the correct quadrant (NE, NW, SE, SW) relative to Chesapeake Light given the reciprocal bearing.

At 0812 you obtain the following information: Chesapeake Light bears 091° T at a range of 10.5 nm What is your 0812 position?

LAT 36°54.6'N, LONG 75°55.8'W

LAT 36°54.4'N, LONG 75°55.9'W

LAT 36°53.7'N, LONG 75°56.0'W

LAT 36°53.8'N, LONG 75°56.1'W

🔍 Key Concepts

💭 Think About

✅ Before You Answer