0 0 RESERVED
1 1 EXCELLENT - WITHIN 3 METRES
2 2 GOOD - WITHIN 10 METERS
3 3 FAIR - WITHIN 20 METRES
4 4 POOR - MORE THAN 20 METRES
5 5 EXCELLENT - WITHIN 10 FEET
6 6 GOOD - WITHIN 30 FEET
7 7 FAIR - WITHIN 60 FEET
8 8 POOR - MORE THAN 60 FEET
15 15 MISSING VALUE