1 files changed, 5 insertions, 0 deletions
diff --git a/units.h b/units.h
index f3c02121a..90d7949b0 100644
--- a/units.h
+++ b/units.h
@@ -71,6 +71,11 @@ typedef struct
 
 typedef struct
 {
+	int32_t seconds; // offsets up to +/- 34 yrs
+} offset_t;
+
+typedef struct
+{
 	int32_t mm;
 } depth_t; // depth to 2000 km