This mob spawns at the partial ship far northwestern part of zone (confirmed in this location), and in ruined buildings on either side (one of these may not actually be a PH, but this isn't confirmed)..
Map points for "dredge.txt" map files (for all Combine Dredge named map points, see this quest entry):
P -439.0325, -1957.1239, 36.2829, 127, 0, 0, 1, Vicarum_Spiritus_Psyche
P -271.8628, -1859.7777, 12.4526, 127, 0, 0, 1, Vicarum_Spiritus_Psyche
P -437.3476, -1774.9912, 12.4127, 127, 0, 0, 1, Vicarum_Spiritus_Psyche
The two PHs in the buildings are each part of a group of 5, so call me lazy if you want but I went for the PH on the ship who has a single cultist as companion. Broke the spawn easy enough and the named popped first time. I didn't notice either of the quoted dots. Easy kill. Beware, there is a scout on the deck right above but he didn't assist.
110 Mage. Air Pet, EM XXI
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Chard ~ 120 Magician of Bertoxxulous Mean Ole Men Formerly a soloer but now twin boxing another mage.