Multiple varios
John:
This is a subject on which experienced glider pilots will disagree on. Many now use electronic instruments exclusively, in which case a single good vario is the norm. Others - who have doubts about battery sustainability (especially on long flights) will want a mechanical back up. I've had batteries fail very far from home and was happy to have a mechanical vario backup. Or it may depend on your OCD medication level . . .
Roy
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