Limit of Navigation

"This is the limit of northern navigation", the captain told Ithemica at the dawn watch when the ship dropped anchor in a small inlet. "From here you must proceed overland by sled. You should reach Iceholt in two days. We will be anchored here for seven days whilst my hunters seek what small and swift game may be found in these barren wastes and we replenish our supplies of drinking water with fresh meltwater. Make sure you are back here by high tide on the sixteenth at the latest, for I will wait no longer to set sail south."