Best thing I purchased for my dob was a Telrad.
This was really helpful especially when using starcharts (paper or electronic) that have a telrad circle overlay. This way I could do my starhops by moving the view in the Telrad (ie move 3 large Telrad cricles to the east).
Most electronic charts Cartes, Du Ciel, etc allow you to create finder cirlces for overlaying on the chart and Sky Atlas 2000 comes with a transparent overlay with a Telrad template on it.
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