TIDMOHM 
 
RNS Number : 3550U 
Offshore Hydrocarbon Mapping PLC 
13 October 2010 
 

 
+----------------+--------------------+------+----------------------------+--------+ 
|                                                                                  | 
+----------------------------------------------------------------------------------+ 
| TR-1: NOTIFICATION OF MAJOR INTEREST IN SHARESi                                  | 
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|                                            |                                     | 
+--------------------------------------------+-------------------------------------+ 
| 1. Identity of the issuer or the           |  Offshore Hydrocarbon Mapping Plc.  | 
| underlying issuer                          |                                     | 
| of existing shares to which voting rights  |                                     | 
| are                                        |                                     | 
| attached: ii                               |                                     | 
+--------------------------------------------+-------------------------------------+ 
| 2 Reason for the notification (please tick the appropriate box or boxes):        | 
+----------------------------------------------------------------------------------+ 
| An acquisition or disposal of voting rights                             |   X    | 
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| An acquisition or disposal of qualifying financial instruments which    |        | 
| may result in the acquisition of shares already issued to which voting  |        | 
| rights are attached                                                     |        | 
+-------------------------------------------------------------------------+--------+ 
| An acquisition or disposal of instruments with similar economic effect  |        | 
| to qualifying financial instruments                                     |        | 
+-------------------------------------------------------------------------+--------+ 
| An event changing the breakdown of voting rights                        |        | 
+-------------------------------------------------------------------------+--------+ 
| Other (please  |                                                        |        | 
| specify):      |                                                        |        | 
+----------------+--------------------------------------------------------+--------+ 
| 3. Full name of person(s) subject   |      CGGVeritas Services Holding B.V.      | 
| to the                              |                                            | 
| notification obligation: iii        |                                            | 
+-------------------------------------+--------------------------------------------+ 
| 4. Full name of shareholder(s)      |                                            | 
|  (if different from 3.):iv          |                                            | 
+-------------------------------------+--------------------------------------------+ 
| 5. Date of the transaction and date |     Transaction Date: October 5, 2010      | 
| on                                  |      Threshold Date: October 6, 2010       | 
| which the threshold is crossed or   |                                            | 
| reached: v                          |                                            | 
+-------------------------------------+--------------------------------------------+ 
| 6. Date on which issuer notified:   |              October 12, 2010              | 
+-------------------------------------+--------------------------------------------+ 
| 7. Threshold(s) that is/are crossed |                   5.49%                    | 
| or                                  |                                            | 
| reached: vi, vii                    |                                            | 
+-------------------------------------+--------------------------------------------+ 
|                |                    |      |                            |        | 
+----------------+--------------------+------+----------------------------+--------+ 
 
+--------------+-----------------+----+------+-----------+----+--+----------------------+-+-----+-----+----------+-------+---------------------+----+--+------------+ 
| 8. Notified details:                                                                                                                                              | 
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| A: Voting rights attached to shares viii, ix                                                                                                                      | 
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| Class/type   | Situation previous                              | Resulting situation after the triggering transaction                                             | 
| of           | to the triggering                               |                                                                                                  | 
| shares       | transaction                                     |                                                                                                  | 
| if possible  |                                                 |                                                                                                  | 
| using        |                                                 |                                                                                                  | 
| the ISIN     |                                                 |                                                                                                  | 
| CODE         |                                                 |                                                                                                  | 
+              +-------------------------------------------------+--------------------------------------------------------------------------------------------------+ 
|              | Number                      | Number            | Number                 | Number of            | % of  voting rights                              | 
|              | of                          | of                | of                     | voting               | x                                                | 
|              | Shares                      | Voting            | shares                 | rights               |                                                  | 
|              |                             | Rights            |                        |                      |                                                  | 
+              +                             +                   +------------------------+----------------------+--------------------------------------------------+ 
|              |                             |                   | Direct                 | Direct xi | Indirect | Direct                           | Indirect      | 
|              |                             |                   |                        |           | xii      |                                  |               | 
+--------------+-----------------------------+-------------------+------------------------+-----------+----------+----------------------------------+---------------+ 
| GB0034272194 | 7,276,266                   | 7,276,266         | 4,976,266              | 4,976,266 | 0        | 5.49%                            | 0.00%         | 
+--------------+                             +                   +                        +           +          +                                  +               + 
|              |                             |                   |                        |           |          |                                  |               | 
+--------------+-----------------------------+-------------------+------------------------+-----------+----------+----------------------------------+---------------+ 
|                                                                                                                                                                   | 
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| B: Qualifying Financial Instruments                                                                                                                               | 
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| Resulting situation after the triggering transaction                                                                                                              | 
+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+ 
| Type of financial                   | Expiration       | Exercise/                            | Number of voting                             | % of voting        | 
| instrument                          | date xiii        | Conversion Period                    | rights that may be                           | rights             | 
|                                     |                  | xiv                                  | acquired if the                              |                    | 
|                                     |                  |                                      | instrument is                                |                    |
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