We chat at start and end of the walk but not during it. This is not to say we do not communicate because a lot can be communicated with a look or a gesture or even just sharing the same space and same experience.
The group was inspired by Vipassana meditation which incorporates silent walking in its practice. However this is a secular group and I ask all to be respectful of each others' world views. Anyone willing to walk with us in silence is "spiritual" enough (whatever that word means) for this group membership.