July 23 (Reuters) - French underwater drone maker Exail Technologies on Thursday posted a 17% rise in second-quarter revenue to €144 million, driven by its navigation and maritime robotic segment. 

• Half-year order intake fell 63% to €228 million ($259.35 million) with the company citing the timing of large maritime robotics program notifications, the contribution of which can vary from year to year.

• Navigation systems orders rose around 40%, photonics orders increased by 47%.

• Order book of €1.02 billion at quarter-end.

• Confirms full year guidance.

($1 = 0.8791 euros)

(Reporting by Hugo Lhomedet and Ronan Corcoran; Editing by Kirsten Donovan)

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