Furuno FR-1500 - Manual (Page 110)

-8.10-
TLL - Target latitude and longitude
Target number, name, position and time tag for use in systems tracking targets.
$--TLL, xx, 1111.11, a, yyyyy.yy, a, c--c, hhmmss.ss, a, a*hh<CR><LF>
Checksum
Reference target = R, null otherwise *
Target status (see note) *
UTC of data *
Target name *
Longitude, E/W
Latitude, N/S
Target number 00 – 99 *
* Not used
NOTE - Target status: L = lost, tracked target has been lost
Q = query, target in the process of acquisition
T = tracking
TTM - 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 = automatic,
M = manual)
Time of data *
Reference target = R, null otherwise
Target status
User data (e.g., target name) *
Speed/distance unit (K/N/S)
Time to CPA, minutes
Distance of closest point of approach
Target course (degrees true), 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)
Not used *