I think in terms of introducing angles compass work is a great route.
Games can be created round compasses where 3 students stand at the centre and the whole class has to stand at different positions. Every time the students guess an angle that is right the whole class can move. The person whose position is guessed joins the centre.
Children working in pairs can follow trails round the school solving problems and collecting clues. The trails can be coordinates and a number of meters. The game can intially be developed around NESW, but as the class develops NNE can be used. Finally the compass directions are changed to degrees.
makingpi 