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iPhone 3GS. The modern swiss army knife. To this, add the "Theodolite" app, which uses the camera to sight through to a target, gives you altitude, tilt and bearing to 0.1 degree.
Use the Location app for terrestrial navigation, or "Starmap Pro" for astronomy. And, via the Emerald Chronometer "Mauna Kea", you have an atomic time standard in your hand. Add the i41CX+ calculator and the surveyors pack, and you have the complete survey station.
Oh, and it does phone calls, SMS, email and surfs the web as well if you need.
Magnetic compasses are so... 18th century.
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