certx

I know this is an old post, but... I want to respond with two different thoughts.... first about the responses, and second about the actual topic... The responses: Everyone seems to have completely missed the fact that the OP is not at all talking about objects drifting in DEC or RA in the field of view through a telescope. He is talking about the coordinates shown in the "Show Position" option in the hand controller's display. ie, the mount itself is not staying pointed, on it's own physical axes, at the specified coordinates. The actual topic: I just bought an Orion Atlas, which is a SkyWatcher EQ6, with SynScan V4 hand controller. I have the EXACT SAME ISSUE. Whether I do an 'x' star alignment or not, use goto or slew using the direction keys, or manually enter coordinates into the user objects. I turn it on, accept the locations it things alignment stars are at, and don't change anything. Slew to a target and start tracking. Go to menu Utility Function -> Show Position, DEC changes on the display by 1 arc second every 20 to 30 seconds. After several minutes, it's several arc seconds off the coordinates I specified, and after a couple hours, it is several arc minutes off of the coordinates I specified in the slew. A couple additional pieces of information: I have the latest SynScan HC firmware and motor control firmware... HC: V4.39.05/Motor: V2.04. When I have it connected to my computer using Starry Night Pro 7, the RA and DEC that it reports back to STP7, via ASCOM do not match the RA and DEC on the hand controller display. DEC is 1 arcminute different and RA is 2.5 arcminutes different, consistently. Those differences never change. Has anyone come up with a cause/solution to this?