It’s the last day of the Izu trip. The group visit the Iidas, who had helped them on their Izu trip and say hi to the hot spring capybaras.
To serve as a reference 
point for measurements.
تؤدّي وظيفة نقطة مرجعيّة للقياسات
Die werden für Abmessungen benutzt.
Serve come riferimento per le misurazioni.
Para servir de referência para medidas.
Опорная точка для геодезических работ.