ten o'clock
On the third morning the Motor Boat Club set out along the wide Stone River , which soon narrowed , as all these southern rivers have a habit of doing , a short distance from its mouth . Then , by degrees , they passed through a tortuous channel , that , being safely navigated , took them in turn to another river , called the Wadmelaw . Passing the lower stretches of the swift running Edisto River , they managed to make the northern shore of St. Helena Sound by the middle of the afternoon ; and an hour later determined to camp there in the open , rather than enter the tortuous watercourses leading to Beaufort . An early start on the following day gave them a chance to pass Beaufort before ten o'clock , and then head for distant Savannah . The course was intricate ; but Jack studied his chart closely ; and besides , they discovered that the channel was located by means of targets which doubtless had been placed there by the steamboat company , so that with any exercise of care they had little excuse for going astray . And as the last of Calibogue Sound was left behind they managed to reach the wide Savannah River , just as the sun was sinking in the west . When the adventurous six left Savannah in their wake , and struck in for the stream below the city which would take them to Wassaw Sound , they knew that they had really started on what was destined to be the last leg of the trip to Florida .