So, I decided to use Apple Developer technical support to understand this. This is the answer:
Hello,
Thank you for contacting Apple Worldwide Developer Technical Support. I am responsible to inform you that I have received your request for technical assistance.
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http://code.google.com/apis/maps/documentation/directions/#DirectionsRequests
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NSString *urlString1 = @"http://maps.google.com/maps?daddr=37.324885,-122.032378&saddr=37.332094,-122.03124";
NSString *urlString2 = @"http://maps.google.com/maps?f=d&source=s_d&saddr=1+Infinite+Loop,+Cupertino,+CA+95014&daddr=Mandarin+Gourmet,+Cupertino,+CA&hl=en&geocode=FcajOQIdYvO5-Ckbd16TtrWPgDFAc4Pi50E92A%3BFZ2GOQIdLe65-CHRv0sTH7YegykLqKn9rbWPgDGUnqKbIqi1Bg&mra=ls&sll=37.325567,-122.032989&sspn=0.007243,0.007285&ie=UTF8&ll=37.328195,-122.031466&spn=0.007243,0.007285&z=17";
[[UIApplication sharedApplication] openURL: [NSURL URLWithString: urlString1]];
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