diff --git a/jpx/src/main/java/io/jenetics/jpx/format/Elevation.java b/jpx/src/main/java/io/jenetics/jpx/format/Elevation.java
index f14c292c..b7af8aae 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/Elevation.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/Elevation.java
@@ -29,12 +29,7 @@
 final class Elevation extends Field {
 
 	Elevation(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'E';
+		super(pattern, 'E');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/Field.java b/jpx/src/main/java/io/jenetics/jpx/format/Field.java
index 10c53ade..3fe2041f 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/Field.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/Field.java
@@ -43,31 +43,27 @@ abstract class Field implements Format {
 		DecimalFormatSymbols.getInstance(Locale.US);
 
 	private final String _pattern;
+	private final char _type;
+
 	private boolean _prefixSign = false;
 	private boolean _absolute = false;
 
 	private final AtomicReference<NumberFormat> _format = new AtomicReference<>();
 
-	Field(final String pattern) {
+	Field(final String pattern, final char type) {
 		_pattern = requireNonNull(pattern);
-		_format.set(new DecimalFormat(toDecimalPattern(pattern), SYMBOLS));
+		_type = type;
+		_format.set(new DecimalFormat(toDecimalPattern(pattern, type), SYMBOLS));
 	}
 
-	private String toDecimalPattern(final String pattern) {
-		return pattern.replace(type(), '0');
+	private static String toDecimalPattern(final String pattern, final char type) {
+		return pattern.replace(type, '0');
 	}
 
-	/**
-	 * Return the type character of this field.
-	 *
-	 * @return the type character of this field
-	 */
-	abstract char type();
-
 	final void setPrefixSign(final boolean b) {
 		_prefixSign = b;
 
-		final String decimalPattern = toDecimalPattern(_pattern);
+		final String decimalPattern = toDecimalPattern(_pattern, _type);
 		final String pattern = _prefixSign
 			? "+%1$s;-%1$s".formatted(decimalPattern)
 			:  decimalPattern;
@@ -111,7 +107,9 @@ public String toPattern() {
 	 * @return the formatted double value
 	 */
 	final String format(final double value) {
-		return _format.get().format(value);
+		synchronized (_format) {
+			return _format.get().format(value);
+		}
 	}
 
 	/**
@@ -130,18 +128,22 @@ final double parse(final CharSequence in, final ParsePosition pos) {
 			s = in.subSequence(0, end).toString();
 		}
 
-		final Number n; synchronized (_format) {
-			n = _format.get().parse(s, pos);
-		}
+		final Number n = parse0(s, pos);
 
 		if (i == pos.getIndex()) {
 			pos.setErrorIndex(i);
-			throw new ParseException("Not found " + _pattern, in, i);
+			throw new ParseException("Not found " + toPattern(), in, i);
 		}
 
 		return n.doubleValue();
 	}
 
+	private Number parse0(final String value, final ParsePosition pos) {
+		synchronized (_format) {
+			return _format.get().parse(value, pos);
+		}
+	}
+
 
 	static double toMinutes(final double degrees) {
 		final double dd = abs(degrees);
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeDegree.java b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeDegree.java
index 6be1b0ea..5566d675 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeDegree.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeDegree.java
@@ -35,12 +35,7 @@
 final class LatitudeDegree extends Field {
 
 	LatitudeDegree(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'D';
+		super(pattern, 'D');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeMinute.java b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeMinute.java
index 4e53e3b5..7195c702 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeMinute.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeMinute.java
@@ -30,12 +30,7 @@
 final class LatitudeMinute extends Field {
 
 	LatitudeMinute(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'M';
+		super(pattern, 'M');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeSecond.java b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeSecond.java
index f789d363..82d999f2 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LatitudeSecond.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LatitudeSecond.java
@@ -30,12 +30,7 @@
 final class LatitudeSecond extends Field {
 
 	LatitudeSecond(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'S';
+		super(pattern, 'S');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeDegree.java b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeDegree.java
index e6a05714..17286858 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeDegree.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeDegree.java
@@ -35,12 +35,7 @@
 class LongitudeDegree extends Field {
 
 	LongitudeDegree(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'd';
+		super(pattern, 'd');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeMinute.java b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeMinute.java
index a08c6bac..b2392dec 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeMinute.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeMinute.java
@@ -30,12 +30,7 @@
 final class LongitudeMinute extends Field {
 
 	LongitudeMinute(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 'm';
+		super(pattern, 'm');
 	}
 
 	@Override
diff --git a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeSecond.java b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeSecond.java
index a837cf33..ea9dca39 100644
--- a/jpx/src/main/java/io/jenetics/jpx/format/LongitudeSecond.java
+++ b/jpx/src/main/java/io/jenetics/jpx/format/LongitudeSecond.java
@@ -30,12 +30,7 @@
 final class LongitudeSecond extends Field {
 
 	LongitudeSecond(final String pattern) {
-		super(pattern);
-	}
-
-	@Override
-	char type() {
-		return 's';
+		super(pattern, 's');
 	}
 
 	@Override public void parse(