We did this over the PA system in 1990. We gave prizes to the correct winners from local restaurants. It was fun. Technology has changed so much now you can do this over your computer and sound system and use student computers for them to locate the answers.
Day1 - Genoa, Italy - Spain - San Salvador or Samana Cay
Day2 - Ferdinand Magellan - Philippines - Straits of Magellan
Day3 - The Great Salt Lake - Salt content is high
Day4 - Titanic - Newfoundland - Southampton
Day5 - LandSat System - Brazil