Could it be that some electro smog is messing with the GPS receiver? I know: it is far fetched, but looking at this setup could very well cause interferences? I'm sure the table has conducting and ferro magnetic components and the unshielded(?) extension cord reel messes with the/creates electro magnetic waves (know that form HAMming - I hope not a magnetic loop antenna like setting). Even though the power goes in and out the wheel same way which usually 'compensates' effects, one never knows until measured. I remember from construction of the metas tower cupola, nothing conducting or magnetic was used in order to get most unbiased environmental measurements in there. That was of course decades ago... :-; http://www.metas.ch - pic attached. ( @user137174, I'm enjoying your gardening...)
it is far fetched,
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