I found the APP to be totally unusable this year. The map kind of worked but I want or need to be able to look up a vendor and be shown where they are located and not have to go to one of the buildings and look at the "sign post" to see what booth location of a particular vendor is. The "map" in the program lists the number of booths but not who is in that booth.
First time we didn't spend ten days at OSH. We came in on Monday mid day due to weather and left Thursday. Frustrated at having to hunt for vendor locations. I try to not ride the trams due to congestion but I walked 28 miles in three days just hunting.