First, since you're a geography student at a top secondary school, you should download the app called Google Earth. It is an excellent tool for your future and may lead you to numerous enjoyable discoveries and to thoughtful work in several Magnet classes.
Someone in your family might have downloaded it already. Check "applications" to see whether you already have Google Earth.
One of the may things you can do with Google Earth is find a map of any city or other location and display - View - it with an overlay - the latitude-longitude grid.
That would be perfect for use in assignment 4, wouldn't it?