diff --git a/extras/test/src/test_GxGGA.cpp b/extras/test/src/test_GxGGA.cpp
index b29517e..1fea5f1 100644
--- a/extras/test/src/test_GxGGA.cpp
+++ b/extras/test/src/test_GxGGA.cpp
@@ -32,7 +32,7 @@ SCENARIO("Extracting satellite system from valid GxGGA message", "[GxGGA-01]")
   WHEN("GPS")
   {
     std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-    nmea::GxGGA::parse(GPGGA.c_str(), data);
+    nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
     REQUIRE(data.source == nmea::GgaSource::GPS);
   }
 }
@@ -40,7 +40,7 @@ SCENARIO("Extracting satellite system from valid GxGGA message", "[GxGGA-01]")
 TEST_CASE("Extracting position time from valid GxGGA message", "[GxGGA-02]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.time_utc.hour        == 11);
   REQUIRE(data.time_utc.minute      == 19);
   REQUIRE(data.time_utc.second      == 8);
@@ -50,7 +50,7 @@ TEST_CASE("Extracting position time from valid GxGGA message", "[GxGGA-02]")
 SCENARIO("Extracting latitude/longiture from valid GPGGA message", "[GxGGA-03]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.latitude  == Approx(48.633433));
   REQUIRE(data.longitude == Approx(13.026492));
 }
@@ -60,7 +60,7 @@ TEST_CASE("Extracting fix quality angle from valid GxGGA message", "[GxGGA-04]")
   WHEN("GPS Fix")
   {
     std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-    nmea::GxGGA::parse(GPGGA.c_str(), data);
+    nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
     REQUIRE(data.fix_quality == nmea::FixQuality::GPS_Fix);
   }
 }
@@ -68,41 +68,41 @@ TEST_CASE("Extracting fix quality angle from valid GxGGA message", "[GxGGA-04]")
 SCENARIO("Extracting number of satellites from valid GPGGA message", "[GxGGA-05]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.num_satellites == 5);
 }
 
 SCENARIO("Extracting horizontal dilution of precision from valid GPGGA message", "[GxGGA-06]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.hdop == Approx(2.4));
 }
 
 SCENARIO("Extracting altitude from valid GPGGA message", "[GxGGA-07]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.altitude == Approx(454.7));
 }
 
 SCENARIO("Extracting geoidal separation from valid GPGGA message", "[GxGGA-08]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.geoidal_separation == Approx(46.6));
 }
 
 SCENARIO("Extracting time since last DGPS update from valid GPGGA message", "[GxGGA-09]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(data.dgps_age == Approx(0.0));
 }
 
 SCENARIO("Extracting DGPS station id from valid GPGGA message", "[GxGGA-10]")
 {
   std::string const GPGGA = "$GPGGA,111908.952,4838.0060,N,01301.5895,E,1,05,2.4,454.7,M,46.6,M,0.0,0000*7A\r\n";
-  nmea::GxGGA::parse(GPGGA.c_str(), data);
+  nmea::GxGGA::parse(const_cast<char *>(GPGGA.c_str()), data);
   REQUIRE(strncmp(data.dgps_id, "0000", 4) == 0);
 }
diff --git a/extras/test/src/test_GxRMC.cpp b/extras/test/src/test_GxRMC.cpp
index aa8608a..46cecd3 100644
--- a/extras/test/src/test_GxRMC.cpp
+++ b/extras/test/src/test_GxRMC.cpp
@@ -33,7 +33,7 @@ SCENARIO("Extracting latitude/longiture from valid GPRMC message", "[GxRMC-01]")
   {
     std::string const GPRMC = "$GPRMC,062101.714,A,5001.869,N,01912.114,E,955535.7,116.2,290520,000.0,W*45\r\n";
 
-    nmea::GxRMC::parse(GPRMC.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
     REQUIRE(data.latitude  == Approx(50.03114442));
     REQUIRE(data.longitude == Approx(19.20189679));
@@ -43,7 +43,7 @@ SCENARIO("Extracting latitude/longiture from valid GPRMC message", "[GxRMC-01]")
   {
     std::string const GPRMC = "$GPRMC,122311.239,A,4056.748,N,11212.614,W,,,290620,000.0,W*63\r\n";
 
-    nmea::GxRMC::parse(GPRMC.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
     REQUIRE(data.latitude  == Approx(40.9458060446613));
     REQUIRE(data.longitude == Approx(-112.210235595703));
@@ -53,7 +53,7 @@ SCENARIO("Extracting latitude/longiture from valid GPRMC message", "[GxRMC-01]")
   {
     std::string const GPRMC = "$GPRMC,122311.239,A,2727.069,S,05859.190,W,,,290620,000.0,W*76\r\n";
 
-    nmea::GxRMC::parse(GPRMC.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
     REQUIRE(data.latitude  == Approx(-27.4511422937699));
     REQUIRE(data.longitude == Approx(-58.986502289772));
@@ -63,7 +63,7 @@ SCENARIO("Extracting latitude/longiture from valid GPRMC message", "[GxRMC-01]")
   {
     std::string const GPRMC = "$GPRMC,122311.239,A,0610.522,S,10649.632,E,,,290620,000.0,W*6D\r\n";
 
-    nmea::GxRMC::parse(GPRMC.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
     REQUIRE(data.latitude  == Approx(-6.17536097471491));
     REQUIRE(data.longitude == Approx(106.827192306519));
@@ -75,13 +75,13 @@ SCENARIO("Extracting satellite system from valid GxRMC message", "[GxRMC-02]")
   WHEN("GPS")
   {
     std::string const GPRMC = "$GPRMC,122311.239,A,0610.522,S,10649.632,E,,,290620,000.0,W*6D\r\n";
-    nmea::GxRMC::parse(GPRMC.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
     REQUIRE(data.source == nmea::RmcSource::GPS);
   }
   WHEN("GNSS")
   {
     std::string const GNSS = "$GNRMC,090348.80,A,4838.00682,N,01301.61381,E,1.533,,301020,,,A*61\r\n";
-    nmea::GxRMC::parse(GNSS.c_str(), data);
+    nmea::GxRMC::parse(const_cast<char *>(GNSS.c_str()), data);
     REQUIRE(data.source == nmea::RmcSource::GNSS);
   }
 }
@@ -90,7 +90,7 @@ TEST_CASE("Extracting speed over ground from valid GPRMC message", "[GxRMC-03]")
 {
   std::string const GPRMC = ("$GPRMC,052856.105,A,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   /* 85.7 kts ~= 44.088 m/s */
   REQUIRE(data.speed == Approx(44.088f));
@@ -100,7 +100,7 @@ TEST_CASE("Extracting track angle from valid GPRMC message", "[GxRMC-04]")
 {
   std::string const GPRMC = ("$GPRMC,052856.105,A,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   REQUIRE(data.course == Approx(206.4f));
 }
@@ -109,7 +109,7 @@ TEST_CASE("Extracting position time from valid GPRMC message", "[GxRMC-05]")
 {
   std::string const GPRMC = ("$GPRMC,052856.105,A,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   /* 052856.105 -> 05:28:56.105 -> */
   REQUIRE(data.time_utc.hour        == 5);
@@ -122,7 +122,7 @@ TEST_CASE("Extracting date from valid GPRMC message", "[GxRMC-06]")
 {
   std::string const GPRMC = ("$GPRMC,052856.105,A,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   REQUIRE(data.date.day   == 8);
   REQUIRE(data.date.month == 7);
@@ -133,7 +133,7 @@ TEST_CASE("Extracting magnetic variation from valid GPRMC message", "[GxRMC-07]"
 {
   std::string const GPRMC = ("$GPRMC,052856.105,A,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   REQUIRE(data.magnetic_variation == Approx(0.0));
 }
@@ -142,7 +142,7 @@ TEST_CASE("Extracted status indicates void ('V') position data", "[GxRMC-08]")
 {
   std::string const GPRMC = ("$GPRMC,052856.105,V,5230.874,N,01321.056,E,085.7,206.4,080720,000.0,W*78\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   REQUIRE(data.is_valid == false);
 }
@@ -151,7 +151,7 @@ TEST_CASE("GxRMC message contains only date and time, but no location fix yet ",
 {
   std::string const GPRMC = ("$GPRMC,144602.00,V,,,,,,,011120,,,N*7B\r\n");
 
-  nmea::GxRMC::parse(GPRMC.c_str(), data);
+  nmea::GxRMC::parse(const_cast<char *>(GPRMC.c_str()), data);
 
   /* RMC TIME = '144602.00' */
   REQUIRE(data.time_utc.hour        == 14);
diff --git a/src/nmea/GxGGA.cpp b/src/nmea/GxGGA.cpp
index 1bd2491..0f2eed3 100644
--- a/src/nmea/GxGGA.cpp
+++ b/src/nmea/GxGGA.cpp
@@ -28,7 +28,7 @@ namespace nmea
  * PUBLIC MEMBER FUNCTIONS
  **************************************************************************************/
 
-void GxGGA::parse(char const * gxgga, GgaData & data)
+void GxGGA::parse(char * gxgga, GgaData & data)
 {
   ParserState state = ParserState::MessadeId;
 
@@ -36,11 +36,11 @@ void GxGGA::parse(char const * gxgga, GgaData & data)
    * with a ',' in order to be able to tokenize all elements
    * including the one before the checksum.
    */
-  *strchr((char *)gxgga, '*') = ',';
+  *strchr(gxgga, '*') = ',';
 
-  for (char * token = strsep((char **)&gxgga, ",");
+  for (char * token = strsep(&gxgga, ",");
        token != nullptr;
-       token = strsep((char **)&gxgga, ","))
+       token = strsep(&gxgga, ","))
   {
     ParserState next_state = state;
 
diff --git a/src/nmea/GxGGA.h b/src/nmea/GxGGA.h
index 98d4e08..f68110b 100644
--- a/src/nmea/GxGGA.h
+++ b/src/nmea/GxGGA.h
@@ -32,7 +32,7 @@ class GxGGA
 
 public:
 
-  static void parse(char const * gxgga, GgaData & data);
+  static void parse(char * gxgga, GgaData & data);
 
 private:
 
diff --git a/src/nmea/GxRMC.cpp b/src/nmea/GxRMC.cpp
index ab4fc8d..4be11bf 100644
--- a/src/nmea/GxRMC.cpp
+++ b/src/nmea/GxRMC.cpp
@@ -35,23 +35,20 @@ constexpr float kts_to_m_per_s(float const v) { return (v / 1.9438444924574f); }
  * PUBLIC MEMBER FUNCTIONS
  **************************************************************************************/
 
-void GxRMC::parse(char const * gprmc, RmcData & data)
+void GxRMC::parse(char * gxrmc, RmcData & data)
 {
   ParserState state = ParserState::MessadeId;
 
-  for (char * token = strsep((char **)&gprmc, ",");
+  /* Replace the '*' sign denoting the start of the checksum
+   * with a ',' in order to be able to tokenize all elements
+   * including the one before the checksum.
+   */
+  *strchr(gxrmc, '*') = ',';
+
+  for (char * token = strsep(&gxrmc, ",");
        token != nullptr;
-       token = strsep((char **)&gprmc, ","))
+       token = strsep(&gxrmc, ","))
   {
-    /* All GPS receivers should at least implement the the fields: UTC Position Fix,
-     * Status, Latitude, Longitude, Speed over ground, Track Angle. All other fields
-     * are optional. Therefore we are checking in the following if statement if the
-     * current token is a checksum token. If that's the case we are directly jumping
-     * to ParserState::Checksum.
-     */
-    if (util::isChecksumToken(token))
-      state = ParserState::Checksum;
-
     ParserState next_state = state;
 
     switch(state)
diff --git a/src/nmea/GxRMC.h b/src/nmea/GxRMC.h
index 9363e72..9d7f47a 100644
--- a/src/nmea/GxRMC.h
+++ b/src/nmea/GxRMC.h
@@ -32,7 +32,7 @@ class GxRMC
 
 public:
 
-  static void parse(char const * gprmc, RmcData & data);
+  static void parse(char * gxrmc, RmcData & data);
 
 private: