This is no different than a military patrol. The infra red light on the goggles allows you to easily keep track of the other team members. If you have night vision on and your partner has his infra red on - it's like a big spot light shining at you in the woods. We heard they were effective when used in conjunction with the night vision. We have not verified this yet.
Communication needs to be with head sets or hand signals.
We did not have head sets and we talked too much. We searched way too fast. We should have approached the search like a deer hunt. The suspect had been gone for 14 or 15 hours at this point. Had we taken the mental attitude that he was still there we would have moved much slower and been much more though in our search.