Escort Default Matrix for matching tugs to tankers
Zones
1 and 2
Zones
4 and 6
Assisting
current
Slack
1
kt
2
kts
3
kts
4
kts
Slack
1
kt
2
kts
3
kts
4
kts
Displacement
*
Braking
force in kips (1,000 pounds of force)
0
to < 20
20
20
30
40
40
40
50
70
90
110
20
to < 30
20
30
40
50
60
50
70
90
120
160
30
to < 40
30
40
50
60
70
60
90
120
160
210
40
to < 50
30
40
60
70
90
70
110
150
200
250
50
to < 60
40
60
70
90
110
100
140
190
250
320
60
to < 80
50
70
90
120
140
120
180
250
330
420
80
to < 100
60
80
110
140
180
150
220
300
400
520
100
to < 120
70
100
130
170
210
180
270
370
500
650
120
to < 140
80
110
150
190
240
210
310
430
580
760
140
to < 160
90
140
190
240
310
240
350
490
660
860
160
to < 180
100
150
210
270
350
260
390
550
740
970
180
to < 200
110
170
230
300
390
*
*
*
*
*
*
*
*
*
*
200
to < 220
120
180
250
330
420
*
*
*
*
*
*
*
*
*
*
* 1,000 long tons.
** The channel depths in zones 4 and 6
limit vessels that may use the channel to those drawing less than 35
feet. Vessels with a displacement greater than 180,000 long tons would
draw more than 35 feet and would thus not be allowed into these zones.
