Core sample orientation

A core drill having a core orientation device comprising:

• an arrangement for providing signals associated with a rotational orientation of the core orientation device;
• processing means for processing the signals provided by the arrangement so as to provide processed data from which a measure of the rotational orientation of the core orientation device can be established, the measure being associated with the rotational orientation of the device at a particular moment in time;
• memory for storing the processed data;
• and interface means having first means for storing the processed data in the memory and second means for accessing the memory to provide the measure of the rotational orientation of core orientation device when required;
• wherein the core drill comprises:
• means for maintaining knowledge of the relative rotational orientation of a core drilled by the core drill and the core orientation device such that a measure of the rotational orientation of the core can be established using the measure of the rotational orientation of the core orientation device.