Non‐linear response of current‐meter compasses: Research note |
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| Authors: | David A Booth Colin Griffiths |
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| Institution: | 1. Ministère des Pêches et Océans , Institut Maurice‐Lamontagne , C.P. 1000, Mont Joli, Québec, G5H 3Z4;2. Département d'océanographie , UQAR , Rimouski, Québec, G5L 3A1;3. Dunstaffnage Marine Laboratory , P.O. Box 3, Oban, Argyll, PA34 4AD, Scotland, U.K. |
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| Abstract: | Abstract A non‐linear response in current‐meter compasses is examined in terms of its effect on the measured residual current. It is shown that, even for a compass response within typical manufacturers’ specifications, the induced errors are important for regions where the residual speed is less than about 10% of the peak tidal current. In an M2 current, the non‐linearity also induces an M4 signal, but this is not sufficiently large to be easily detected by tidal analyses. |
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