Hi everyone, Ledger team, which makes Nano Ledger, has posted this: Bitcoin Gold will fork on block 491407 - just hold your BTC in a Legacy or Segwit address before. Nothing else necessary. What does Legacy or Segwit address mean? Thanks!
In the latest version of the Ledger software you can choose to hold your Bitcoin in Legacy or Segwit format. The Ledger team are just saying it doesn't matter which you choose, which is good.