there's 3 lists:
map rotation - this is what gets used when there's no vote (i.e. empty server)
cp_dustbowl
pl_goldrush
pl_badwater
default vote list - this is the list of maps that appear in the vote list if noone nominates anything
cp_well
cp_granary
cp_dustbowl
cp_gravelpit
cp_badlands
pl_goldrush
pl_badwater
plr_pipeline
cp_coldfront
cp_frieght_final1
pl_upward
plr_hightower
pl_thundermountain
and finally, the nominate list - the list of maps that someone can nominate
cp_goldrock_gulch_b1
cp_badlands
cp_dustbowl
cp_fastlane
cp_frieght_final1
cp_furnace_b3
cp_gorge
cp_granary
cp_gravelpit
cp_gullywash_rc
cp_junction_final
cp_well
cp_snowbowl
cp_yukon_final
ctf_aerospace_b3
ctf_doublecross
ctf_sawmill
ctf_vector_b3
pl_snowrush_b3
pl_badwater
pl_cashworks_rc2
pl_dbheights_b5
pl_frontier
pl_goldrush
pl_great_heights_b2
pl_happycow_Z4
pl_hoodoo_final
pl_swift_final
pl_waste_final
plr_pipeline
tc_hydro
cp_warpath
ctf_bayou_c
ctf_haarp_b2
ctf_panamint_a17
ctf_permuda_b1a
ctf_slate_b1
ctf_snowdrift_b2
ctf_vector_c3
plr_animus_a8
plr_arctic_c
plr_cornfield_c1
plr_highwind_a4
plr_nightfall_c
plr_panic_b1
plr_rollout_a3
plr_sawmill_a1
plr_scoville_c2
plr_solitude_b1
cp_egypt_final
cp_wildmire_b3
ctf_atrophy_b4
cp_coldfront_rc2
cp_freight
cp_obscure_rc3
cp_mainline_rc5
pl_upward
plr_hightower
pl_thundermountain
the middle list - the default vote list - is I suppse what can be considered our main map list