diff --git a/flight/pygnc/configuration/pygnc.py b/flight/pygnc/configuration/pygnc.py
index 034f64c..e5eb90c 100644
--- a/flight/pygnc/configuration/pygnc.py
+++ b/flight/pygnc/configuration/pygnc.py
@@ -2,8 +2,10 @@
 import warnings
 
 batch_sensor_gps_filepath = os.path.expanduser("~/sense.bin")
+range_sensor_filepath = os.path.expanduser("~/rng*.bin")
 
 status_filepath = os.path.expanduser("~/pygnc_status.bin")
 info_filepath = os.path.expanduser("~/pygnc_info.txt")
 
 log_dir_filepath = os.path.expanduser("~/pygnc_logs/")
+
diff --git a/flight/pygnc/configuration/ranging_estimator.py b/flight/pygnc/configuration/ranging_estimator.py
new file mode 100644
index 0000000..601f149
--- /dev/null
+++ b/flight/pygnc/configuration/ranging_estimator.py
@@ -0,0 +1 @@
+filename = '~/rng*.bin'
\ No newline at end of file