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When only a single charted object is available for observation, a navigator can obtain a running fix by:

1. ATaking one bearing and advancing it along the DR track until it intersects the vessel's course line
2. BTaking two bearings to the same object at different times and advancing the first LOP to the time of the second
3. CTaking a simultaneous range and bearing to the object using radar
4. DPlotting the DR position at the time of the single bearing observation