[syousef]

I've recently ordered a digital compass with just that in mind. It would have the advantage of not requiring the base to be positioned firmly, which means it can go on wheels. What I've found so far with my cheap analog hiking compass is that moving the large metal tube of the telescope also seems to cause the needle to move by as much as 15-20 degrees.

I'm hoping the digital compass would at least have the advantage of being accurate within 2 degrees without being as difficult to read in the dark. A larger compass might also do. However I am not as hopeful about eliminating deviation caused by the telescope itself.

My dob is currently on castors and has been for some years. Before I did that I use to be able to get within about 2-3 degrees with painstakingly hand drawn setting circles. I am planning to get off my proverbial sometime soon and find a good way of locking the wheels so there's no movement. I'm thinking feet or wedges will do the trick. When I do. Failing that I'll take the castors off and buy a hand truck. I miss the accuracy that gave me before I put the wheels on.

I think that with the amount of time/money/effort that goes into buying or building a dob, it's insane that good setting circles don't come as standard!