Borehole surveying instruments; installations for surveying purposes; instruments for surveying physical data; apparatus for remote surveying; borehole surveying apparatus; electronic apparatus for surveying; surveying apparatus and instruments; computer hardware for use with drilling apparatus; computer hardware for use with drilling instrument; computer hardware for use with drilling operations; computer programs for dynamic simulation of oil well drilling; computer programs for electronic image processing; electronic image processing apparatus; electronic image processing instruments; programs for electronic image processing; computer programs for providing a graphical presentation of data; computer programs for scientific data analysis; recorded computer programs for scientific research; apparatus for data processing; computer programs for the analysis of data processing procedures; electric apparatus for data processing; data processing apparatus; data processing apparatus for use with computers; data processing devices; electrical data processing apparatus; apparatus for interconnecting data processing equipment; couplers (data processing equipment); data processing equipment; electronic apparatus for data processing; electronic data processing apparatus; electronic data processing devices; electronic data processing equipment; readers (data processing equipment); scanners (data processing equipment); data processing systems; data processing instruments; data processing programmes; data processing machines; data processing software for graphic representations; data processing software; display apparatus for use with data processing installations; instruments for electronic data processing; computer programs for data processing; programs for data-processing; real-time data processing apparatus; remote data processing apparatus; terminals for remote data processing; sensors for real time data input apparatus; sensors for real time data output apparatus; electrical apparatus for data acquisition; data acquisition instruments; data acquisition apparatus; apparatus for the acquisition of data; airborne data acquisition apparatus; application software; communication software; communications processing computer software; computer software; computer software (programs); computer software (recorded); computer software for use in controlling machines; computer software programs; data communications software; downloadable software applications (apps); integrated software packages; interactive computer software; interfaces between application programs and firmware on real-time computers; computer interfaces; computer interface units; interface apparatus for computing apparatus; interfaces (for computers); peripheral interface units for computers; process control operator interface units