JRC JAN-701B Instruction Manual page 165

The following operation should be carried out to set the base point of floating EBL/VRM at the
ship's center:
1) Make sure that the base point of the displayed EBL1 is not fixed and floating.
The base point moves on the ship..
ECDIS
[Resetting the Base Point at the Ship's Position]
3-103 3 Basic Operation of ECDIS