The navigation interface of 1 kailide has "+"and "-"symbols. Press "+"to zoom in and "-"to zoom out; You can also slide the screen, draw a straight line from bottom to top to enlarge the map, and draw a straight line from top to bottom to reduce the map. As shown in the figure:

Shenzhen Kailide Technology Co., Ltd., formerly known as Shenzhen Kailide Computer System Technology Co., Ltd. (referred to as Kailide), is the first brand of GPS navigation software in China. Kailide entered the navigation field from 1999, accompanied by the germination, start and development of China's navigation industry. 1999 started the research and development of navigation software, and took the lead in developing a navigation engine with independent intellectual property rights in China; In 2000, we began to develop the navigation map of China. In 2005, it obtained the qualification of navigation electronic map making (Grade A surveying and mapping), and in 2006, it released the first "full coverage" navigation electronic map in China.

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