The TSS in the "Nine Degree Channel" might not displayed in Navstation due to overlapping ENC cells. The TSS can normally be found on the ECDIS where the IN122MBC are being displayed. 

The TSS is only available in the cell IN122MBC and not the GB202738. The Navstation uses a different way to select cells to be displayed compared to the ECDIS. Both these cells have compilation scale 1: 700 000 and the GB202738 overlaps the Indian cell. 

For some reason the ECDIS select to display IN122MBC and not GB202738, as the Navstation do the opposite.