The aim of this thesis was to test and find out whether StarFire RTG correction service and C-Nav positioning equipment would match the requirements set for Finnish Maritime Administrations sea surveying operations. Second purpose was to describe and document the operating principle and structure of StarFire RTG.

The theory part is based of documents written by different companies and parties behind the developement and marketing of the StarFire RTG system. Different companies call the StarFire RTG and its operational concepts by different terms, because of various licenses and trademarks involved. Also, the companies did not usually mention the roles of other companies connected with StarFire RTG in their documents.

A plan was formed to conduct the test surveying. However, due to various problems with testing equipment and mere ill-fortune, the testing was mostly performed in Helsinki city area. In addition, a brief test was carried out on the multibeam ship Airisto.

The results of the surveys show that StarFire RTG has big potential when decimeter class surveying accuracy is needed. However, the system was unrealiable at most of the testing sites. At most sites there were problems with unidentified interference sources, which weakened the antennas’ ability to track the L2-signal. When L2-signal was weak, the C-Nav equipment would use less satellites in the position solution than it actually could have used. At its worst, the L2-signal interference made the surveying impossible.

The testing of StarFire RTG and C-Nav equipment will be continued during the next surveying season on 2009.