Thanks all, I don't think it is site management, as I think this was setup correctly. However, in my understanding, this wouldn't result in a continuous slew (which is the one that bothers me). As I said before, it might mean I don't slew to the correct location, but I will check through that again and ensure it is all correct.

One thing that does worry me is whether this relates to the fact I'm doing a serial connection into the handset, rather than bypassing the handset. Would this mean any difference - does the time/location of the handset actually come into this, or is it irrelevant because we're in PC direct mode (which is as I thought it was). Ideally I'd put a EQD cable in, but haven't got to that yet. I also wondered if comms issues might have resulted in the continous slew, but I don't know if I could debug this somehow. This is a r-pi with a usb-serial (prolifics) to the mount. The r-pi is also running the DSLR and a v4l guide cam (spc900). I'm wondering if thats too much without a powered hub too.

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