Two categories of GPS timing receivers have been identified for real time applications. Performances of a few such receivers have been studied. The GPS time in some of the receivers has been found to have some bias error. This demands the necessity of the calibration of the GPS receiver prior to its precise application. It has been observed that the time error (or phase error) normally remains constant for a particular receiver. So this may not affect the frequency accuracy.

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A facile synthesis of rhinacanthin-A is achieved by the side chain cyclization of lapachol with meta-chloroperbenzoic acid along with stenocarpoquinone-A, stenocarpoquinone-B and its isomer.

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