Exercise involving flying "1,000km beyond First Island Chain"
I can't, yet, read Chinese. So, maybe you can help me. You mention a distance of 1000 km beyond the First Island Chain, yet this construct comprises many islands of varying distances from their most proximal points on mainland (as one reference point). Does the article give the precise metric from which this 1000 km was measured?
Here is an excerpt of my geospatial contextualization of the Island Chain construct to provide some reference.
The distances from the eastern Chinese coastline to the
first island chain are as such: to the proximate island
Yona Guni, ~382 km, and to the distal island,
Tanega-Shima, ~842 km. Thus the average distance from the eastern Chinese coastline to the first island chain, as a whole, is
~612 km.