Appx. 2 Longitude Error Table (96 Nm Scale - Furuno FAR-2228-NXT Operator's Manual

APPX. 2 LONGITUDE ERROR TABLE
(96 NM SCALE)
The longitude lines concentrate on the north pole and south pole, namely, 1 nm is equivalent to 1
minute at 0 degree latitude, 2 minutes at 60 degrees latitude, 3 minutes at 70 degrees latitude and
so on. For this reason, a longitude error occurs on the radar display.
For example, when own ship is at 60°N and 135°E, even if the cursor indication is 62°N and 139°E,
the real cursor position is deviated to the left (west) side. The table below shows the longitude er-
ror, represented from 0° to 90° at 96 nm from the radar center (own ship).
AP-9