Welcome to the forum Paul. We have a long-running thread about the Ross system which a large number of well-informed people are subscribed to. If you post your question in there it will certainly get answered and probably quite quickly.
I'll look up the thread just now - in the meantime I've closed this one to avoid duplication.
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I've copied yr post over to here:
Could you please visit that thread and add as much extra information as you can, such as whether you used a sat finder etc.