S4 states that Nautical Charts can have Transverse Mercator Projection till 1:50 000 scale. Whereas INT2 states that E Style Border can be placed till 1:30 000. In normal practice for all the charts with projection TM we place chart border of E style. So if we have a chart of scale smaller than 1:30 000 and till 1:50 000 we choose TM projection. Here the interesting point is what style of border we choose from INT2. If anybody wants to strictly follow INT2 they should opt for F style border. But considering the scale and projection one can definetely opt for E style border. Finally its left to respective Hydrographic Offices to opt for best practice in Nautical Chart production.