Sink the teacher’s fleet using 4-figure grid references! A PPT resource designed for whole class practice/revision of their map skills, ideal for Year 7 Geographers or even Duke of Edinburgh practice. Give each student in the class a chance to fire their map skills torpedo in turn. If they score a hit, they can keep going until they miss - but they have to correctly provide a 4-figure grid reference, or else their torpedo misfires and play is passed to the next student.