Garmin Edge 705 not recognizing newly installed sensor
I installed a new GSC 10 speed/cadence sensor on my tandem and it appears to be configured the same as on my single. But, I am unable to get my 705 to show speed or cadence when using it on my workstand and turning the pedals by hand.
Quick question also -- isn't speed calculated by the internal GPS? If so, then why is there a speed sensor included? I understand the cadence part of it.
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-\Brian
18' Landshark Tandem - Custom
15' Wabi Special Single-Speed Road
06' Cannondale Six13 TeamOne
06' Cannondale Prophet 3 "Lefty"
92' Trek 5200