diff --git a/src/main/java/de/serosystems/lib1090/Position.java b/src/main/java/de/serosystems/lib1090/Position.java
index 0fb14af..1427e48 100644
--- a/src/main/java/de/serosystems/lib1090/Position.java
+++ b/src/main/java/de/serosystems/lib1090/Position.java
@@ -146,7 +146,7 @@ public void setAltitudeType(AltitudeType altitudeType) {
 	/**
 	 * Calculates the two-dimensional great circle distance (haversine)
 	 * @param other position to which we calculate the distance
-	 * @return distance between the this and other position in meters
+	 * @return distance between this and other position in meters
 	 */
 	public Double haversine(Position other) {
 		double lon0r = toRadians(this.longitude);
@@ -200,7 +200,7 @@ public static Position fromECEF (double x, double y, double z) {
 		// correct for numerical instability in altitude near exact poles:
 		// after this correction, error is about 2 millimeters, which is about
 		// the same as the numerical precision of the overall function
-		if (abs(x) < 1 & abs(y) < 1)
+		if (abs(x) < 1 && abs(y) < 1)
 			alt = abs(z) - b;
 
 		return new Position(toDegrees(lon), toDegrees(lat), Tools.meters2Feet(alt), AltitudeType.ABOVE_WGS84_ELLIPSOID);