/** Constants for conversion */
private static final double CONVERT_FEET_TO_METRES = 0.3048;
private static final double CONVERT_METRES_TO_FEET = 3.28084;
/** Constant for no altitude value */
/** Constants for conversion */
private static final double CONVERT_FEET_TO_METRES = 0.3048;
private static final double CONVERT_METRES_TO_FEET = 3.28084;
/** Constant for no altitude value */