Furuno FR-2105-B - Manual (Page 160)

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Channel 3 output
RATTM - Tracked target message
$RATTM,xx,x.x,x.x,a,x.x,x.x,a,x.x,x.x,a,c---c,a,a,hhmmss.ss,a*hh<CR><LF>
Checksum
Type of acquisition (A/M/R) *1
Time of data (UTC)*2
Reference target = R, null otherwise
Target status
User data (e.g., target name) *2
Speed/distance unit (K/N/S) (N-type only)
Time to CPA (0-99.9 min)
CPA (00.00-99.99 nm)
Target course (degrees), true/relative (T/R)
Target speed
Bearing from own ship (degrees), true/relative (T/R)
Target distance from own ship
Target number (00 to 99)
*1: Edition 2 only, *2: Not used