Techniques are disclosed for validating that an operator has moved a portable device sufficiently close to an inspection point to enable the operator to perform an inspection. A first exemplary technique employs a first portable device that includes a sensor for detecting the inspection point, a speaker, and stored audible prompts to facilitate the inspection, but no display on which visual prompts for facilitating the inspection can be provided. An alternative second exemplary technique employs a second portable device having a sensor for detecting the inspection point, and a wireless transmitter. This second portable device generates and immediately transmits a signal to a remote receiver indicating that the operator has moved the portable device sufficiently close to the inspection point to enable the operator to perform the inspection. Accordingly, the second portable device need not include a memory for storing the signal.