ARTOA4-UserManual/Offsets.md

@@ -36,6 +36,8 @@ calculated by ARTOA "Calculate offsets" How????
 
 value is set by either copying "Measured", "Emprical" or " Optimum" to "Applied" (see window "Offset controls", lower right) or by manually typing into this field.
 
+**_!_** _column Applied Soundspeed must be populated with values for each SoSo used in the inversion to be able to execute "Calculate Offsets". The value is used to calculate the hypothetical travel time from the distance between the Satellite-Fix position and the respective Sound Source  **!**_
+
 **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".
@@ -60,8 +62,10 @@ calculated by ARTOA "Calculate offsets" by inverting the eqation:
 
 value is set by either copying "Measured", "Emprical" or " Optimum" to "Applied" (see window "Offset controls", lower right) or by manually typing into this field.
 
-**_!_** _column Applied Offsets must be populated to be able to execute "Calculate Offsets".  The value is used to calculate the Satellite-Fix to Sound Source hypothetical travel time from the respective distance **!**_
+**_!_** _values in the column Applied Offsets are applied towards the TOA prior to attemptig an inversion **!**_
 
 **column Applied Drift (editable !)**
 
 value is set by either copying "Measured", "Emprical" or " Optimum" to "Applied" (see window "Offset controls", lower right) or by manually typing into this field.
+
+**_!_** _values in the column Applied Drift are applied towards the TOA prior to attemptig an inversion **!**_
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