Going North on GSP. At the I-78/Union Toll Booth, keep to the sharp right. The exit is immediately to the right after the Toll Booth. Ypo'll be heading East.  You need to get to the other side of I-78. Do this by following I-78 East to Exit 54, Hillside/Irvington. Watch for the I-78 West signs, follow them through the intersection. Once back on I-78 West, go to  Exit 50B, Millburn/Maplewood. At top of ramp turn right onto Vauxhall Road  Go to the third light and turn right onto Valley St. Continue on Valley 6 lights to Parker Ave. (Shell Gas Station)  Turn right onto Parker Ave and continue to Summit Avenue. Make a left onto Summit Avenue.  Turn Right on Garfield Place.  Underhill Field is at the end of Garfield Place.  GPS = Garfield Place and Burr Rd or approx 50 Burr Rd