   pinMode(5,INPUT_PULLUP);
 }
 void loop(){
-  // Copy any completed sentence to 2nd buffer
+  // Copy any completed sentence to the buffer, set up for next sentence.
   if ( sentenceRdy ) {
     for ( int i = 0 ; i < GPSLEN ; i++ ) {
         sentenceBuf2[i] = sentenceBuf[i];

/*
 * SERIAL1: GPS and LOGGER 
 * SERIAL2: RF IN/OUT
 */
#define GPSLEN 100 //max length of GPS output to be sent
char pkt_buffer[200];

        i++;
    }
    sentenceRdy = false;
  } else { // Buffer data is being updated. Use current sentence
    Serial1.print( "BUF" );
    while( sentenceBuf2[i+1] != 0 ) {
        Serial2.write( sentenceBuf[i] );
