I believe when the original contract was put in place, Google was licensing their street data from one of the GPS incumbents with a "no turn by turn" restrictio

I believe when the original contract was put in place, Google was licensing their street data from one of the GPS incumbents with a "no turn by turn" restriction. It was only later that Google made their own street data and could offer turn by turn. In that light, it makes sense that Apple's contract had the restriction.