diff --git a/src/components/Blockly/blocks/sensebox-display.js b/src/components/Blockly/blocks/sensebox-display.js
index c4f0de0..96d8fd3 100644
--- a/src/components/Blockly/blocks/sensebox-display.js
+++ b/src/components/Blockly/blocks/sensebox-display.js
@@ -49,10 +49,10 @@ Blockly.Blocks["sensebox_display_printDisplay"] = {
       .appendField(new FieldSlider(1, 1, 4), "SIZE");
     this.appendDummyInput()
       .appendField(Blockly.Msg.senseBox_display_printDisplay_x)
-      .appendField(new FieldSlider(0, 0, 128), "X");
+      .appendField(new FieldSlider(0, 0, 127), "X");
     this.appendDummyInput()
       .appendField(Blockly.Msg.senseBox_display_printDisplay_y)
-      .appendField(new FieldSlider(0, 0, 64), "Y");
+      .appendField(new FieldSlider(0, 0, 63), "Y");
     this.appendValueInput("printDisplay")
       .appendField(Blockly.Msg.senseBox_display_printDisplay_value)
       .setCheck(null);
diff --git a/src/components/Blockly/generator/sensebox-sd.js b/src/components/Blockly/generator/sensebox-sd.js
index 395844b..ab54e47 100644
--- a/src/components/Blockly/generator/sensebox-sd.js
+++ b/src/components/Blockly/generator/sensebox-sd.js
@@ -162,15 +162,15 @@ void addMeasurement(const char *sensorId, float value) {
         }
     `;
     Blockly.Arduino.functionNames_["writeMeasurementsToSdCard"] = `
-void writeMeasurementsToSdCard(char* timeStamp, uint32_t latitudes, uint32_t longitudes) {
+void writeMeasurementsToSdCard(char* timeStamp, int32_t latitudes, int32_t longitudes) {
     // iterate throug the measurements array
         for (uint8_t i = 0; i < num_measurements; i++) {
             char lng[20];
             char lat[20];
             float longitude = longitudes / (float)10000000;
             float latitude = latitudes / (float)10000000;
-            dtostrf(longitude, 2, 7, lng);
-            dtostrf(latitude, 1, 7, lat);
+            dtostrf(longitude, 8, 7, lng);
+            dtostrf(latitude, 8, 7, lat);
             sprintf_P(buffer, PSTR("%s,%9.2f,%s,%02s,%02s"),  measurements[i].sensorId, measurements[i].value, timeStamp, lng, lat);
             // transmit buffer to client
             ${filename}.println(buffer);