Which preposition to use with whaleboats

on Occurrences 3%

As there was every probability of the ship being detained in this neighbourhood for some days, searching for traces of Lieutenants Grey and Lushington's party, and as the examination of Collier Bay, where we still hoped to find an opening leading into the interior, would prevent the necessity of our return to this part of the coast, I applied to Captain Wickham, for permission to proceed with the two whaleboats on that service.

in Occurrences 1%

After making observations of the bar, which appeared to be practicable for whaleboats in moderate weather if the wind be south of west, we returned along the south shore of the estuary, which is about one and a half mile long and half a mile wide; it does not appear to be of any great depth.

Which preposition to use with  whaleboats