Optional use of ECDIS
For the future, to facilitate the display of radar video over official ENCs, it is
recommended that the Hydrographic Offices set the compilation scales of their official
ENCs to be consistent with the standard radar range scales as shown in the following
table:
Selectable Range Standard scale (rounded)
200 NM 1:3 000 000
96 NM 1:1 500 000
48 NM 1:700 000
24NM 1:350 000
12 NM 1:180 000
6 NM 1:90 000
3 NM 1:45 000
1.5 NM 1:22 000
0.75NM 1:12 000
0.5 NM 1:8 000
0.25 NM 1:4 000
table: Radar range / standard scale
How are official ENCs named?
Each official ENC is identified by an 8 character identifier e.g. FR 501050
annaabi.ee 
