Furuno FELCOM 81B - Manual (Page 58)

5.4 Attaching the Compass Safe Distance and
Inmarsat B Seals
Attach the compass safe distance seals (supplied with
installation materials) for the units shown below.
When the same units (for example: telephone, facsimile,
etc.) are used for other than FELCOM 81, attach ""seals b
to them to distinguish.
5.4 Attaching the Compass Safe Distance and Inmarsat B Seals
5-4