This is an application that displays information on J-Cluster, an amateur radio web cluster used exclusively in Japan for amateur radio. * function - Cluster information display: Displays J-Cluster information. ・Selective display: Displays spots by all modes, CW, Phone, Digital, and commemorative stations. ・Custom display: Displays up to 3 types of arbitrary modes and band spots. ・Details display: Tap a spot to display the details of the spot. - Coloring of commemorative stations: Colors the ca