Create new NTv2 grid in seconds or degrees?

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Create new NTv2 grid in seconds or degrees?

Jochem
This post was updated on .
I am going to create a new NTv2 grid (.gsb file). The current version of the NTv2 grid has all values in arcseconds. I was thinking of making the new grid in degrees. However, it seems to me that Proj.4 ignores the units in line 4 of the header (see below) and always assumes the values to be in arcseconds. Is that correct?

Regards, Jochem

---
NUM_OREC 11
NUM_SREC 11
NUM_FILE  2
GS_TYPE SECONDS
VERSION NTv2.0  
SYSTEM_FBSSL1841
SYSTEM_TETRS89  
MAJOR_F  6377397.155
MINOR_F  6356078.963
MAJOR_T  6378137.000
MINOR_T  6356752.314
SUB_NAMENL_ALL  
PARENT  NONE    
CREATED 08-02-13
UPDATED        
S_LAT     181800.000000
N_LAT     201000.000000
E_LONG    -27600.000000
W_LONG     -9000.000000
LAT_INC      300.000000
LONG_INC     300.000000
GS_COUNT  4095
 -2.860042  2.752380  0.001000  0.001000
 -2.860456  2.709846  0.001000  0.001000
...