   gpsTimeFlg = false;
   gpsZDAFlg = false;
   gpsTFFlg = false;
-
   updateTarget();
-
+  if ( DEBUG ) {
+    Serial.print( "ISR duration: " );
+    Serial.print( micros() - tmpMicros );
+  }
 }
 
 void procAprs() {

#define CMDLEN TERMLEN
#define APRSFILEN TERMLEN
#define DEBUG true


const int elDrvPin = 16;

const int eeaddrElPot0 = eeaddrAzPotMax + sizeof( int );
const int eeaddrElPot90 = eeaddrElPot0 + sizeof( int );

/*
 * Parameters to use with TEST enabled
 */
const float testLat = 41.09 * deg2rad;
const float testLon = -87.9167100 * deg2rad;
const float testAlt = 434.3;

 /*
 * Copernicus II configured for two NMEA sentences every 60 seconds:
 *  ZDA:Provides nothing until first fix, then provides full date
