One key use [of Argo] was when we were moving a 37-foot Sea Ray from Middle River to the Gunpowder, which needed to be at the bridge at low tide. It was a cold rainy Saturday morning and we headed out around 7:30 a.m. only to find that the GPS was not functioning. Then the wipers went out. Thankfully we had the Argo app. I was at the helm, the boat owner held the app and kept us within our boundaries…