iPhone version of Surveyor is now available in AppStore!
The name of the iPhone app is 'GyroSurveyor'. You can download it for free in AppStore.
The reason I use the name 'GyroSurveyor' is because that this iphone version uses gyroscope and the name 'Surveyor' is already taken by another app.
I have to say that gyroscope is really awesome. It's much more sensitive and accurate than magnetic sensors that work in Android devices. I can't wait for Nexus S and see how gyroscope performs on Android.