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If I had the option to get a mouse or a usb dongle, which is better performance wise?
I’d probably put the gps mouse in between the dovetail plate and telescope. (I use an FRA500 refractor) Or a usb dongle on the hub on top of the ota.
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Really not a lot of difference between the two as they are both likely to use the same chip, probably a U-blox7 or similar. As long as they have access to clear sky there won't be much difference - not sure if placing it in between the dovetail plate and telescope will have much/any effect, though I did find mine worked better being in a totally clear area away from ANY obstruction.
I've used mine for other things so the lead/magnet on the mouse has been handy. And as it doesn't need to remain connected after obtaining & setting the location info the lead isn't an issue at all.
Cheers,
Mark