ARTOA4-UserManual/Offsets.md

 **column Offset Start Date (non editable)**
 
-taken from "-offset" in  soso file. Gives date on which Offset Start was determined
+taken from "-offset" in soso file. Gives date on which Offset Start was determined
 
 **column Offset Start (non editable)**
 
@@ -16,7 +16,7 @@ taken from "-rcv_offset" in soso file. Gives SoSo offset on Offset End Date (neg
 
 **column Drift (non editable), \[seconds/day)**
 
-taken from "-drift" in soso file.  Manually calculated by editor of soso file as: 
+taken from "-drift" in soso file. Manually calculated by editor of soso file as:
 
 (Offset_End - Offset_Start) / (Offset_End_Date - Offset_Start_Date)
 
@@ -26,12 +26,16 @@ calculated by"Sound_Speed_Method" on basis of average temperature of selected te
 
 **column Empirical SoundSpeed (non editable)**
 
-taken from "-sound_speed" in soso file.  (Note to programmer: Should be changed to "-empiric_sound_speed for consistency of nomencalture)
+taken from "-sound_speed" in soso file. (Note to programmer: Should be changed to "-empiric_sound_speed for consistency of nomencalture)
 
 **column Optimum SoundSpeed (non editable)**
 
-calculated by ARTOA "Calculate offsets"  How????
+calculated by ARTOA "Calculate offsets" How????
 
 **column Applied SoundSpeed (editable !)**
 
-value set by either copying "Measured", "Emprical" or " Optimum" to "Applied" (see window "Offset controls", lower right) or by manually typing into this field. 
+value set by either copying "Measured", "Emprical" or " Optimum" to "Applied" (see window "Offset controls", lower right) or by manually typing into this field.
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+
+**column Emprical Offset (non editable)**
+
+taken from "-empric_offset" in soso file. Gives Empric Offset entered manually by editor of soso file based on experiece.  Should be associated with data given in "Offset Start Date".
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