Upvote:6
Addresses work similarly in Turkey to most countries, in that a postcode is a general area. The point that your sat nav is showing will likely be the centre of that postcode area.
As Henning pointed out, however, that area may be quite large. Here in the UK, urban postcode areas are very small (a few houses) but out in the country they can take in a much larger area.
So in order to get accurate guidance, putting the street address in will be best. Michael's comment linked to a useful document explaining the address structure in Turkey. As you can see it is basically the same as here in the UK: