National carrier
0 = unspecified
1 = Spain / Uruguay
2 = Portugal / Brazil
3 = Great Britain
4 = Netherlands
5 = U.S.A.
6 = France
7 = Denmark / Baltic
8 = Portuguese to Span Amer > 1830

Port(consolidated)
1 = Spanish America
2 = Other Americas
3 = Amazonia
4 = Bahia
5 = Pernambuco
6 = SE Brazil
7 = Brazil unspecified
8 = Africa
9 = Europe
10 = Other unspecified

Coverage of route in TSTD
1 = both
2 = only embarkation region
3 = only disembarkation region
4 = neither
5 = inferred data

Major region of embarkation in TSTD
0 = Unspecified
1 = Senegambia
2 = Sierra Leone
3 = Windward Coast
4 = Gold Coast
5 = Bight of Benin
6 = Bight of Biafra
7 = West Central Africa
8 = South-east Africa

Major region of disembarkation in TSTD
0 = Unspecified
100 = Europe
201 = Northern U.S.
202 = Chesapeake
203 = Carolinas / Georgia
204 = Gulf states
205 = U.S.A. unspecified
301 = Jamaica
302 = Barbados
303 = Antigua
304 = St. Kitts
305 = Grenada
306 = Dominica
307 = British Guiana
308 = St. Vincent
309 = Montserrat / Nevis
310 = Trinidad / Tobago
311 = Other British Caribbean
401 = Saint-Domingue
402 = Martinique
403 = Guadaloupe
404 = French Guiana
405 = French Caribbean unspecified
501 = Dutch Caribbean
502 = Dutch Guianas
600 = Danish West Indies
701 = Cuba
702 = Puerto Rico
703 = Spanish Central America
704 = Rio de la Plata
705 = Other Spanish Americas
801 = Amazonia
802 = Bahia
803 = Pernambuco
804 = South-east Brazil
805 = Brazil unspecified
900 = Africa

Broad region of disembarkation in TSTD
0 = Unspecified
100 = Europe
200 = Mainland North America
300 = British Caribbean
400 = French Caribbean
500 = Dutch Americas
600 = Danish West Indies
700 = Spanish Americas
800 = Brazil
900 = Africa

Embarkation region (adjusted)
1 = Senegambia
2 = Sierra Leone
3 = Windward Coast
4 = Gold Coast
5 = Bight of Benin
6 = Bight of Biafra
7 = West Central Africa
8 = South-east Africa

Disembarkation region (adjusted)
100 = Europe
201 = Northern U.S.
202 = Chesapeake
203 = Carolinas / Georgia
204 = Gulf states
205 = U.S.A. unspecified
301 = Jamaica
302 = Barbados
303 = Antigua
304 = St. Kitts
305 = Grenada
306 = Dominica
307 = British Guiana
308 = St. Vincent
309 = Montserrat / Nevis
310 = Trinidad / Tobago
311 = Other British Caribbean
401 = Saint-Domingue
402 = Martinique
403 = Guadaloupe
404 = French Guiana
405 = French Caribbean unspecified
501 = Dutch Caribbean
502 = Dutch Guianas
600 = Danish West Indies
701 = Cuba
702 = Puerto Rico
703 = Spanish Central America
704 = Rio de la Plata
705 = Other Spanish Americas
801 = Amazonia
802 = Bahia
803 = Pernambuco
804 = South-east Brazil
805 = Brazil unspecified
900 = Africa

Slave route as documented in database
405 = ‘Unknown - French Caribbean unspecified '
1311 = ‘Senegambia - Other British Caribbean '
1405 = ‘Senegambia - French Caribbean unspecified '
1703 = ‘Senegambia - Spanish Central America '
2311 = ‘Sierra Leone - Other British Caribbean '
2405 = ‘Sierra Leone - French Caribbean unspecified '
2703 = ‘Sierra Leone - Spanish Central America '
2705 = ‘Sierra Leone - Other Spanish Americas '
3311 = ‘Windward C. - Other British Caribbean '
3405 = ‘Windward C. - French Caribbean unspecified '
3703 = ‘Windward C. - Spanish Central America '
3705 = ‘Windward C. - Other Spanish Americas '
4311 = ‘Gold Coast - Other British Caribbean '
4405 = ‘Gold Coast - French Caribbean unspecified '
4703 = ‘Gold Coast - Spanish Central America '
5311 = ‘B. of Benin - Other British Caribbean '
5405 = ‘B. of Benin - French Caribbean unspecified '
5703 = ‘B. of Benin - Spanish Central America '
5705 = ‘B. of Benin - Other Spanish Americas '
6311 = ‘B. of Biafra - Other British Caribbean '
6405 = ‘B. of Biafra - French Caribbean unspecified '
6703 = ‘B. of Biafra - Spanish Central America '
6705 = ‘B. of Biafra - Other Spanish Americas '
7203 = ‘W Central Africa - Carolinas & Georgia '
7205 = ‘W Central Africa - U.S.A. unspecified '
7309 = ‘W Central Africa - Montserrat & Nevis '
7310 = ‘W Central Africa - Trinidad & Tobago '
7311 = ‘W Central Africa - Other British Caribbean '
7405 = ‘W Central Africa - French Caribbean unspecified '
7600 = ‘W Central Africa - Danish West Indies '
7703 = ‘W Central Africa - Spanish Central America '
7705 = ‘W Central Africa - Other Spanish Americas '
7804 = ‘W Central Africa - South-east Brazil '
7805 = ‘W Central Africa - Brazil unspecified '
8405 = ‘SE Africa - French Caribbean unspecified '

Inferred region to count annual exports/imports
1 = missing region supplied
2 = Portuguese unspecified