While mariners benefited from the accurate charts, they could not receive telegraph signals while under way, and so could not use the method for navigation. This changed when wireless telegraphy (radio) became available in the early 20th century. Wireless time signals for the use of ships were transmitted from Halifax, Nova Scotia, starting in 1907 and from the Eiffel Tower in Paris from 1910. These signals allowed navigators to check and adjust their chronometers frequently.
While mariners benefited from the accurate charts they could not receive telegraph signals while under way and so could not use the method for navigation This changed when wireless telegraphy (radio) became available in the early 20th century Wireless time signals for the use of ships were transmitted from Halifax Nova Scotia starting in 1907 and from the Eiffel Tower in Paris from 1910 These signals allowed navigators to check and adjust their chronometers frequently