FLUSH MOUNT TEMPLATEGPSMAP 172C/178C(EXTERNAL ANTENNA VERSIONS ONLY)© Copyright 2004 Garmin Ltd. or its subsidiariesGarmin International, Inc. 1200 East 151st Street, Olathe, Kansas 66062, U.S.A.www.garmin.comPart Number 190-00321-04 Rev. B June 2004 Printed in Taiwan(3.93")100.0 mmDRILL A 3/8" HOLE.BEGIN CUTTINGHERECUT MOUNTING SURFACE ALONGTHE INSIDE OF THIS LINEUNIT OUTLINEBe very careful when cutting this hole,there is only a small amount of clearancebetween the unit and the Mounting Hole.Drill four 3mm (1/8") mounting holes at the indicated locations.Install the four Mounting Studs into unit by screwing the shorter sectionin to the back of the unit.Use a .050" Allen Wrench to tighten the Mounting Studs until thestop contacts the case. Be careful not to overtighten as this may damage theMounting Stud! The studs have a reusable thread-locking patch pre-appliedfrom the factory.Place the unit in position in the cut out in the mounting surface.Place washers over the Mounting Studs, then thread on one Hex Nut perMounting Stud.Tighten all four until the unit is snug against the mounting surface.Install and tighten the second Hex Nut on all four Mounting Studs to lockthe first one in place.Provide adequate clearance to press together the data card coverhandles and for the data card cover to swing open freely.mm(5.43")138.0