Furuno FR-8051 manual Categorization by Specification, Xiv, Function Type

CATEGORIZATION BY SPECIFICATION

This series of marine radars are designed to comply with the standards of various national rules and regulations. Operational convenience is enhanced with the two categories as below although the basic design approach is the same.

Function	R-type	N-type
Guard zone alarm	"In" or "Out" alarm	"In" alarm only
VRM/cursor unit of	nm, km, sm	nm only
readout
EBL/cursor bearing	True/relative, selectable	Head-up: relative
readout	in any mode	CU, NU, TM: true
Own ship mark	Available (symbol or dot)	Not available (dot only)

R-type: For fishing boats, pleasure boats, non-Convention cargo ships

N-type: For non-Convention ships in the Netherlands and other countries where the radars must be approved based on IMO A.477(XII), although not wholly.

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