Furuno FCR-2107 Series Operator's Manual page 520

Appendix 5: Digital Interface
RSD - Radar system data
$RARSD,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,a,a*hh<CR><LF>
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| | | | +------------------------------------ 5
| | | +---------------------------------------- 4
| | +-------------------------------------------- 3
| +------------------------------------------------ 2
+---------------------------------------------------- 1
1. Origin 1 range, from own ship (see note 2)
2. Origin 1 bearing, degrees from 0 (see note 2)
3. Variable range maker 1(VRM1), range
4. Bearing line 1(EBL1), degrees from 0
5. Origin 2 range (see note 2)
6. Origin 2 bearing (see note 2)
7. VRM2, range
8. EBL2, degrees
9. Cursor range, from own ship
10. Cursor bearing, degrees clockwise from 0
11. Range scale in use
12. Range units, K/N/S
13. Display rotation (see note 1)
14. Checksum
NOTES
1 Display rotation:
C = course-up, course-over-ground up, degrees true
H = head-up, ship's heading(center-line) 0 up
N = north-up, true north is 0 up
2 Origin 1 and origin 2 are located at the stated range and bearing
from own ship and provide for two independent sets of variable range
markers (VRM) and electronic bearing lines (EBL) originating away from
own ship position.
AP-68
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| | | | | | | +--------- 12
| | | | | | +------------ 11
| | | | | +---------------- 10
| | | | +-------------------- 9
| | | +------------------------ 8
| | +---------------------------- 7
| +-------------------------------- 6
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| | +----- 14
| +------- 13