When Nick & Kat came down from the tower Nick tried to deceive Kevin & Claire by talking about the DS13 they saw. Technically that was not a lie (since they actually saw it), but he also said they were going to it and that was not really true.
But I wonder if it would not have been more effective to answer the question "Did you find anything?" with something like "Yes, we saw the next route marker". That is technically not a lie (the figuring could count as a route marker) but could possibly cause the next team to spend a lot of time to look for a yellow and red flag.