diff --git a/lib/simplify.js b/lib/simplify.js
index 961261d..e94f997 100644
--- a/lib/simplify.js
+++ b/lib/simplify.js
@@ -7,7 +7,7 @@ var degreeTags = [{
 	name: 'GPSLatitude',
 	refType: 0x0001,
 	refName: 'GPSLatitudeRef',
-	posVal: 'N'
+	posVal: 'S'
 },
 {
 	section: exif.GPSIFD,
@@ -15,7 +15,7 @@ var degreeTags = [{
 	name: 'GPSLongitude',
 	refType: 0x0003,
 	refName: 'GPSLongitudeRef',
-	posVal: 'E'
+	posVal: 'W'
 }];
 var dateTags = [{
 	section: exif.SubIFD,
@@ -44,7 +44,7 @@ module.exports = {
 			var degreeVal = getTagValue(t);
 			if(degreeVal) {
 				var degreeRef = getTagValue({section: t.section, type: t.refType, name: t.refName});
-				var degreeNumRef = degreeRef === t.posVal ? 1 : -1;
+				var degreeNumRef = degreeRef === t.posVal ? -1 : 1;
 				var degree = (degreeVal[0] + (degreeVal[1] / 60) + (degreeVal[2] / 3600)) * degreeNumRef;
 				setTagValue(t, degree);
 			}