diff --git a/Adafruit_GPS.h b/Adafruit_GPS.h
index 1cdad58..c256cf6 100755
--- a/Adafruit_GPS.h
+++ b/Adafruit_GPS.h
@@ -16,6 +16,7 @@ Written by Limor Fried/Ladyada  for Adafruit Industries.
 BSD license, check license.txt for more information
 All text above must be included in any redistribution
 ****************************************/
+// Fllybob added lines 34,35 and 40,41 to add 100mHz logging capability 
 
 #ifndef _ADAFRUIT_GPS_H
 #define _ADAFRUIT_GPS_H
@@ -31,10 +32,14 @@ All text above must be included in any redistribution
 // different commands to set the update rate from once a second (1 Hz) to 10 times a second (10Hz)
 // Note that these only control the rate at which the position is echoed, to actually speed up the
 // position fix you must also send one of the position fix rate commands below too.
+// added line below for 10 sec update
+#define PMTK_SET_NMEA_UPDATE_100mHZ  "$PMTK220,10000*2F"
 #define PMTK_SET_NMEA_UPDATE_1HZ  "$PMTK220,1000*1F"
 #define PMTK_SET_NMEA_UPDATE_5HZ  "$PMTK220,200*2C"
 #define PMTK_SET_NMEA_UPDATE_10HZ "$PMTK220,100*2F"
 // Position fix update rate commands.
+// added line below for 10 sec update
+#define PMTK_API_SET_FIX_CTL_100mHZ  "$PMTK300,10000,0,0,0,0*2C"
 #define PMTK_API_SET_FIX_CTL_1HZ  "$PMTK300,1000,0,0,0,0*1C"
 #define PMTK_API_SET_FIX_CTL_5HZ  "$PMTK300,200,0,0,0,0*2F"
 // Can't fix position faster than 5 times a second!
diff --git a/examples/shield_sdlog/shield_sdlog.ino b/examples/shield_sdlog/shield_sdlog.ino
index 55632fc..757030b 100644
--- a/examples/shield_sdlog/shield_sdlog.ino
+++ b/examples/shield_sdlog/shield_sdlog.ino
@@ -16,7 +16,7 @@
 //    ------> http://www.adafruit.com/products/
 // Pick one up today at the Adafruit electronics shop 
 // and help support open source hardware & software! -ada
-
+// Fllybob added 10 sec logging option
 SoftwareSerial mySerial(8, 7);
 Adafruit_GPS GPS(&mySerial);
 
@@ -124,7 +124,7 @@ void setup() {
   // For logging data, we don't suggest using anything but either RMC only or RMC+GGA
   // to keep the log files at a reasonable size
   // Set the update rate
-  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 1 or 5 Hz update rate
+  GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);   // 100mHz,1Hz or 5Hz update rate
 
   // Turn off updates on antenna status, if the firmware permits it
   GPS.sendCommand(PGCMD_NOANTENNA);