Thank-you for your revised manuscript. I am now asking for you to consider “Technical Corrections” (see comments below) after which it should go direct to the OS Editorial system for publication. There will be copy-editing; please ensure that this retains your intended meaning. Thank-you for submitting to Ocean Science.
John Huthnance

Comments
Page 2.
Line 8. “moments” – please check consistent terminology c.f. page 3 lines 27-28.
Line 23. You could omit “short” (because you give the length and also because it is too long for your purpose).
Line 26. “, and it results” -> “; however, the size and shape result”?
Line 33. “Our goal is to measure the response . .” (this sentence needs a verb).

Page 3.
Line 5. “existing wave buoys are generally too large”. I don’t think this applies to Surpact. You need to say what is Surpact’s disadvantage for your purpose.
Lines 13, 20. These formulae for fr and fa seem inconsistent. fr is not a frequency.
Lines 13 et seq. and page 4 line 1 et seq. σ is used for frequency and directional spread. Better to have different symbols.

Page 4.
Equations (4), (6) depend on the normalisation of an, bn (n=1,2) as defined by (7). I guess this is a standard convention but it might better be mentioned earlier.
Line 8 = Line after (6). Omit first “of”.
Line 22. Better “. . above the water surface, in particular . .”

Page 5.
Lines 4-5. The ribs show better in figure 2.
Line 5. “. . in figure 2 . .”
Line 28. “Better “. . and power consumption . .”

Page 8.
Line 10. “level” -> “surface”
Lines 13-14. “. . optimization of the rotation matrix given by a SBG motion package . .”

Page 9, figure 3 caption line 2. “. . starting in red; (b) . .”

Page 10 line 11. “. . depends on both”

Page 11.
Line 11. Delete “each”

Page 12, figure 4 caption line 4. “. . coefficients written in the figures are computed considering both data sets . .”. Also the last sentence of the figure 5 caption “The statistical parameters . . normalized root mean square error (NRMSE)” should be here in the figure 4 caption.

Page 15.
Line 3. Delete “the” before “280°”. Please state convention for direction. From the text implying waves from the south (approximately) I guess this is the mathematical 280° but there is no standard use in oceanography.

Page 16 line 10. I think the formula for S might be better written S = Lk^2 Cd U10^2 / (2πg) to bring all division together.

Page 17 figure 9. There should be another value (0.3?) on the f axis.

Page 18 line 6. Better “. . from the instrument GPS allowed to”?

References. “Oceanography” spelling for Page 20 lines 7, 31, 34; page 21 line 2.
Page 20 line 33. I think “Prentice-Hall” should be added as this is a book.

Page 21.
Line 3. Does the Technical Report have a number / code or something like that?
Line 9. “Geophysical”