The predicted time that the flood begins at the entrance to Delaware Bay is 1526. You are anchored off Chestnut St. in Philadelphia. If you get underway bound for sea at 1300 and turn for 13 knots, at what point will you lose the flood current?
• Tidal current predictions vs. local time of current change upriver • Effect of distance upriver and speed over ground on where you are when a current reverses • Using nautical miles, knots, and time together to find position at a given future moment
• How long after 1300 will the flood begin at the entrance to Delaware Bay, and what does that clock time correspond to? • At the moment the flood starts at the entrance, how far downriver (in nautical miles) will you have traveled from Chestnut St. at 13 knots? • Which charted location or river mile in the answer choices is closest to that distance from Philadelphia?
• Be sure you are using time underway from 1300, not from 1526 • Convert speed and time correctly: knots × hours = nautical miles • Confirm the approximate river distance from Philadelphia to each named point (New Castle, Billingsport, Marcus Hook, Mile 52) before choosing.
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