Apple Maps is near worthless in my country (can't find numerous businesses).
I'd rather have Google Maps.
You could use the following, and you don't need data to run them.
https://itunes.apple.com/us/app/sygic-singapore-malaysia-gps/id358731886?mt=8
https://itunes.apple.com/my/app/tomtom-south-east-asia/id431581795?mt=8
https://itunes.apple.com/us/app/garmin-sg-my/id504487726?mt=8