UPDATE 1-Boskalis says order book down, confirms outlook

* Revenue, order intake stable so far this yr

* Order book down slightly vs year-end 2008

* Shares down 1.9 pct

(Adds detail, background)

AMSTERDAM, May 14 (Reuters) - Dutch dredging group Royal Boskalis Westminster NV (BOSN.AS) reiterated its outlook for lower 2009 earnings on Thursday, as its order book declined slightly in the year to date.

Boskalis, the world's largest dredger, said revenues and order intake were stable on the year so far, but its order book and equipment utilisation were down on the year.

"Order intake was at the same level as last year, but clients are becoming increasingly cautious about their investment decisions," said Chief Executive Peter Berdowski in a statement.

Shares in the dredger were down 1.9 percent at 16.99 euros by 1234 GMT, underperforming the Amsterdam AEX .AEX index, which was down 0.2 percent.

The company had warned in March that profit would be lower this year due to a "radical" fall in its maritime infrastructure markets as it reported a 15 percent rise in 2008 net profit, excluding exceptional items, to 235.7 million euros.

Boskalis is one of a quartet of Dutch and Belgian dredgers which are leaders in a global market where demand had outstripped supply in recent years, giving Boskalis the ability to raise prices and select projects with the highest margins.

But concerns of overcapacity sparked by weakening demand are rising and various infrastructure projects have been recently delayed or cancelled.

(Reporting by Catherine Hornby; editing by Elaine Hardcastle)