updated ultrasonic function

config.py

@@ -18,7 +18,7 @@
 # when using the mag how many degrees offset from the gps is it?
 mag2gps_degree_offset = -20
 # how many degrees in the heading are close enough to be accurate
-turning_degree_accuracy = 10
+turning_degree_accuracy = 7
 # what is considered to low in battery voltage to continue functioning?
 voltage_min_threshold = 9
 # how often to read the ultrasonic sensors