diff --git a/.gitignore b/.gitignore
index e59ab9a..df3e329 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,3 +13,4 @@
 *.dwl
 *.dwl2
 *.bak
+__pycache__
diff --git a/tools.py b/tools.py
new file mode 100644
index 0000000..1145e6a
--- /dev/null
+++ b/tools.py
@@ -0,0 +1,7 @@
+
+from decimal import Decimal
+
+def deg(deg, mm, ss):
+    return (Decimal(deg) +
+        Decimal(mm) / Decimal(60) +
+        Decimal(ss) / Decimal(3600)).normalize()