價格：免費
檔案大小：49.5 MB
版本需求：系統需求：iOS 9.0 或以後版本。相容裝置：iPhone、iPad、iPod touch。
支援語言：英語
Signals XXI is an interactive and bidirectional digital platform whose objective is to reinforce the maritime signaling for navigation and the sending of alerts (24/365) unipersonal that have a course, speed and cannon marked on the digital platform an imminent risk of collision or incorrect funding.
支援平台：iPhone, iPad