The reasons why they needed to name different spots on the Island Swiss family are:
So they can map the Island; and
So they can give thanks to God for saving them from the ship accident.
<h3>What is the Swiss Family Robinson about?</h3>
"The Swiss Family Robinson" tells the story of a Swedish family's shipwreck and survival on an unexplored Pacific Ocean island.
Knowing that assistance is unlikely, they begin exploring the island, recovering everything they can from their sunk ship and constructing a suitable home.
The major point that Thomas Pain was trying to make using the evidence in the passage was that The Continental Army had a realistic chance of winning against the British.