okay, first time to look into Geocaching, have found caches in Fort Worth, by chance, Okay, received a suspicious package call. However, my keen senses told me it was harmless... so, what APP is best for the Iphone, I do not own a stand alone GPS. I have Theodolite and spyglass, however, I do not see how they would work for this type of activity...Thanks ahead of time...and the clock is ticking as we get closer to trip time....