The Auxiliary Fleet ( Tren Naval in spanish ) comprises all minor auxiliary vessels, self-propelled or not, owned and manned by the Armada, that operate inside docks, ports, stations and naval bases, that have assigned support tasks for surface vessels and submarines.
Like in many other NATO navies, all units assigned to this force are marked with the letter Y ( stands for Yard ). Nowadays these units support management of training torpedoes, coastal mining, instruction duties and diving support, besides common logistic support duties.

Considering that information on the actual status of the auxiliary fleet is almost non-existing, the number of active units should be around 133.

FERROL (21)

NumberName (Class, Type)Details
Y122(Coastal tug) ...See data
Y126(Coastal tug)  
Y176(Push tug) ...See data
Y180(Submarine-support push tug) ...See data
Y211(Fuel barge) ...See data
Y251(Diesel lighter) ...See data
Y422(Dirty waters barge) ...See data
Y539(Barge) ...See data
Y555(Personnel launch) ...See data
Y559(Personnel launch) ...See data
Y560(Personnel / Divers launch)  
Y561(Personnel / Divers launch)  
Y562(Personnel / Divers launch)  
Y617  
Y618  
Y619  
Y631  
Y632  
Y633 ...See data
Y634  
Y635  

LA GRAÑA (7)

NumberName (Class, Type)Details
Y589(Personnel / Divers launch) ...See data
Y809Orballo (Sail, races) ...See data
Y836Tambo (Sail, training, Cirrus ¾, [YTS]) ...See data
Y844La Guía (Sail, training, Toxo, [YTS]) ...See data
Y859Mirfak (Sail, races, Farr 42´, [YTS]) ...See data
Y861Anduriña (Sail, training) ...See data
Y863Alegranza (Sail, training) ...See data

CARTAGENA (18)

NumberName (Class, Type)Details
Y124(Coastal tug) ...See data
Y178(Submarine-support push tug) ...See data
Y179(Submarine-support push tug) ...See data
Y181(Submarine-support push tug) ...See data
Y222(Self-propelled barge fuel) ...See data
Y423(Dirty waters barge) ...See data
Y541(Barge) ...See data
Y558(Personnel launch) ...See data
Y568(Barge)  
Y620  
Y621  
Y622  
Y636  
Y806Kochab (Sail, races)  
Y817Sirius IV (Sail, races) ...See data
Y854Cabo de Agua (Sail, training, Toxo, [YTS]) ...See data
Y856Sagita (Sail, training, Toxo, [YTS]) ...See data
Y857Capella (Sail, training, Toxo, [YTS])  

LA ALGAMECA (9)

NumberName (Class, Type)Details
Y365(Self-propelled pontoon) ...See data
Y503(Personnel launch) ...See data
Y564(Torpedo recovery launch)  
Y567(Personnel launch) ...See data
Y581(Small diving tender) ...See data
Y585(Small diving tender)  
Y586(Small diving tender) ...See data
Y587(Small diving tender) ...See data
Y588(Small diving tender)  

MAHÓN (5)

NumberName (Class, Type)Details
Y182(Submarine-support push tug) ...See data
Y502(Personnel launch) ...See data
Y527(Personnel launch) ...See data
Y563(Diving tender)  
Y847Isla Pinto (Sail, training, Toxo, [YTS]) ...See data

PORTO PÍ (5)

NumberName (Class, Type)Details
Y454(Harbor cleaner)  
Y505(Personnel launch) ...See data
Y802Aifos (Sail, races, IC45, [YTS]) ...See data
Y848Illetas (Sail, training, Toxo, [YTS])  
Y849Alcanada I (Sail, training, Toxo, [YTS])  

ROTA (10)

NumberName (Class, Type)Details
Y118(Coastal tug) ...See data
Y121(Coastal tug) ...See data
Y123(Coastal tug) ...See data
Y175(Submarine-support push tug) ...See data
Y421(Dirty waters barge)  
Y513(Personnel launch)  
Y532(Barge) ...See data
Y549(Personnel launch) ...See data
Y554(Personnel launch) ...See data
Y569(Support and rescue of sail ships)  

LA CARRACA (18)

NumberName (Class, Type)Details
Y125(Coastal tug) ...See data
Y177(Submarine-support push tug)  
Y212(Dirty waters barge)  
Y221(Self-propelled barge fuel)  
Y231(Fuel lighter)  
Y255(Diesel lighter) ...See data
Y318(Barge)  
Y425(Dirty waters barge) ...See data
Y426(Dirty waters barge)  
Y506(Personnel launch) ...See data
Y557(Personnel launch) ...See data
Y822Rigel (Sail, races)  
Y823Canopus (Sail, races)  
Y832Betelgeuse (Sail, training, ¾ ton, [YTS])  
Y851Rota (Sail, training, Toxo, [YTS]) ...See data
Y852Alcanada II (Sail, training, Toxo, [YTS]) ...See data
Y853Diamante (Sail, training, Toxo, [YTS])  
Y862Sirius VI (Sail, races) ...See data

PUNTALES (6)

NumberName (Class, Type)Details
Y174(Submarine-support push tug) ...See data
Y528(Personnel launch)  
Y538(Barge)  
Y583(Small diving tender) ...See data
Y590(Personnel / Divers launch) ...See data
Y592(Small diving tender) ...See data

LAS PALMAS (12)

NumberName (Class, Type)Details
Y147(Harbour tug) ...See data
Y148(Harbour tug) ...See data
Y424(Dirty waters barge) ...See data
Y453(Harbor cleaner)  
Y509(Personnel launch)  
Y529(Personnel launch)  
Y556(Personnel launch) ...See data
Y584(Small diving tender)  
Y591(Personnel / Divers launch) ...See data
Y824Porto Pí (Sail, training)  
Y850Nublo (Sail, training, Toxo, [YTS])  
Y864Isla de Lobos (Sail, races)  

MARÍN (16)

NumberName (Class, Type)Details
Y183(Submarine-support push tug) ...See data
Y501(Personnel launch)  
Y504(Personnel launch) ...See data
Y512(Personnel launch)  
Y514(Personnel launch)  
Y801Sirius V (Sail, races, Farr 50´, [YTS])  
Y818Aldán (Sail, races, First 40.7, [YTS]) ...See data
Y819Cíes (Sail, training, Jeanneau Sun Fizz 41´, [YTS])  
Y834Ons (Sail, training, Puma 38´, [YTS]) ...See data
Y835Onza (Sail, training, Puma 38´, [YTS]) ...See data
Y858Penizas (Sail, races, First 260 Spirit, [YTS]) ...See data
Y865Beluso (Sail, training) ...See data
Y867Combarro (Sail, training)  
Y869Firme (Sail, training)  
Y870Diligente (Sail, training)  
Y871Constante (Sail, training)  

TORREGORDA ( Army ) (1)

NumberName (Class, Type)Details
Y705(Auxiliary unit, Duarry Sportech 13,5, [YFL]) ...See data

MELILLA (1)

NumberName (Class, Type)Details
Y703Capitán Oses (Auxiliary unit) ...See data

CEUTA (1)

NumberName (Class, Type)Details
Y702Capitán García Almenta (Auxiliary unit)  

SOLLER (1)

NumberName (Class, Type)Details
Y846Sóller (Sail, training, Toxo, [YTS]) ...See data

MADRID (Pantano de San Juan) (2)

NumberName (Class, Type)Details
Y866Berenice (Sail, races)  
Y872Aldebarán (Sail, races)