Abstract: Compass apparatus includes a housing defining a liquid-filled sealed interior space and a compass card member disposed within the liquid-filled space for rotation therein. The housing comprises an upper transparent cover portion having an outwardly directed first flange extending around the perimeter thereof and a lower housing portion, preferably formed of elastic material, having an annular elastic flange extending around the periphery thereof, the upper surface of the latter flange abutting against the lower surface of the first flange in liquid sealing engagement therewith. A connecting ring having a U-shaped cross section maintains the abutting flanges in sealing engagement with each other thereby providing a housing which is simple to close and which may be reopened and reclosed as desired in a manner such that the integrity of the liquid seal is not impaired. A sealing ring member may be provided between the elastic flange of the lower housing portion and the lower flange of the connecting ring.