no... they don't counteract... they interact! however.... if you are in an open area where you ALWAYS have access to the satellites... you won't need the speed magnet....
the speed magnet only kicks in when you go in a tunner or under heavy tree cover... where i live.. i have neither (although on a couple of different rides out of my area... i have gone into tunnels.. and yes.. you lose gps signal.....
looking at your location... i would think you would want the spoke/speed magnet to pick up the slack... cuz don't you have a lot of tree cover?
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