1. It seems that the Vietnamese IQ is generally not high! I said many times, now you do not understand: What is the geographic coordinates. let me tell you how to use Google Maps to show the accurate location!
2 .In 1831 ,”Pracel” is a long strip region (this region: wide 106.5km long 500km). French description is too simple, there is no geographic coordinates as a reference. We do not know what geographic coordinates as a starting point, get equal distances of conclusion. Using Google Maps, starting from the northern "Pracel", arrived in Vietnam or on Hainan Island, the distance is over 200 kilometers (see satellite map). For example, people says that Korea is close to the distance from China, this proposition is established. But the problem is that China's territory is large, The fact that only in northeastern China is relatively close distance of Korea.
3. View map, Viet Nam arrived Hainan Island or Malaysia map scales roughly correct. According to Viet Nam,"黃沙" and "萬里長沙" is the Xisha and Nansha Islands, and then you will find: The map scale is a serious error! if According to this map scale,The Vietnamese side as long as necessary, Can put the coast of Vietnam some islands , Apply to become Java and Timor. It is simply not yet reached the time.
4. This map of the Chinese character meaning Annan ancient map, time for 1938, Appear the European Latin characters. Closer look, we can find a lot of serious problems: 1. Annan 1803 was renamed in Vietnam, but this 1838 map, why do you show Annan? 2. French 1858 invasion of Vietnam in 1885 colonial Vietnam, why this 1938 map appear Latin characters? 3.This map source is unknown, the production time is confusing, draw loosely and there have been many significant errors. So, can we suspect that this map is a fake?
5-6. How do you know "紅船" or "田姑船"speed? You said the speed is no real basis. Your premise is not that established, how can we reach the right result? As I have described in very clear, in 1776, when the ship's features are: small size, poor endurance, speed is very slow! In July 1795, From "廣南江口" to "占婆島", a distance of about 12 km, Chinese monks in the after noon (16:00) starting, The second day morning (24:00) reach. The journey time of eight hours, an average speed of 1.5km / h, sailing 72 hours, the voyage also 108km. From here through the ”Pracel“ the so-called Vietnam: "黃沙" and "萬里長沙", Need 197.5km, reach the Xisha Islands would need at least 250.75km.
7. I have the front that very clear, China's destiny by their own Control. China is not Vietnam, a poor and backward country, Can only be a pawn of big powers( The China in World War I), Country's destiny is not controlled by your own! Also, I would like to say: you are not only low-IQ, and eye problems. I have already released the 1712 map, does your eyes blind ?Do not see?
The Map of South and East Ocean Sea Routes was drawn in between 1712-1721 by Qing (Ching) Dynasty Fujian (Fuchien) Province Navy Commander Shi Shibiao, the son of a famous early Qing Dynasty Imperial Officer. This map shows clearly the sea routes, time and decriptions from Chinese coastal ports to Japan, Laos, Vietnam, Indonesia,Brunei, Cambodia and the Phinllipines. In this map, the locations and names of the Southern Sea Islands(Nanhai Zhudao) are very accurate. The map shows clearly Chinese sovereignty over the South China Sea Islands including Nansha Islands, Xisha Islands, Zhongsha Islands and Dongsha Islands.Also note the "long bar area" shown in this map which locates close to the Vietnamese coast, which clearly tells that the so called "Truong Sa" and "Hoang Sa" as shown in the 1838 "Complete Map of Unified Great Nam" are not the Nansha (Spratlys) and Xisha (Paracels) Islands of China at all, but refers to the Pullo Canton near the central Vietnamese coast, which was also once been identified as "dangerous group" and named Paracels before Paracels was used to refer to China's Xisha Islands later.