Some observing programs, especially those using RxW in the north at RA of approximately 10hrs, suffer from a distinct paucity of strong local pointing sources. The technique adopted is to point with another instrument and use established offsets between the Front Ends to correct the pointing from one FE to another.

However, the relative pointings themselves have not been particularly well-established in the past, and must be redetermined whenever a FE is adjusted. Additionally, these circumstances arise infrequently enough that the capability to do this work is often left until the need is great.

Such was the case in January 2001, but the effort was made to align SCUBA, RxB and the D-band mixer of RxW. It seems worth recording for posterity that the results were deemed sufficiently satisfactory by the observer to warrant this comment in her nightly report :

4) DETAILED NOTES (Optional)
Differential pointing for RxW/RxB3 seems to be working extremely well. 
Repeated what had been done before (mars: RRP/KGI OMC-1: IMC/JH) 
and got very reproducible results. 

It is to be hoped that well-determined relative pointing can be maintained henceforth.