Vertical jigging for grouper has a reputation for being expensive and unreliable. Anglers buy premium jigs, fish a full tide over the wrong bottom, and go home empty, then decide hamour does not take metal. It does, just not across open sand. A grouper sits tight against hard structure, hits once, and turns straight back down into the rocks. The whole job is putting the jig within a metre of that edge and being ready for the first two seconds.
Depth and current decide the jig, not the price tag. In 15 to 20 metres with light current, 80 to 120 grams drops fast and keeps you in contact. At 30 metres with current running, go to 150 or 200 grams; anything lighter planes behind the boat and never reaches bottom.
Watch the line on the drop: a stop means the jig landed or snagged, while a line still peeling out means you are underweighted. Carry three weights and change weight before changing marks; that saves mornings.
Grouper lives on transitions: natural rock meeting sand, the skirt of a sunken structure, the outer line of a reef patch. On the sounder, look for a change in bottom texture, not the tallest mark. Dropping on the edge lets the jig work down the face. Dropping into the middle of the rock usually costs you the jig on the first drop.
This is not a fast burn like kingfish jigging. Lift the rod half a metre to a metre at a steady speed, then let the jig fall freely and sit a beat or two on the bottom. Most takes come on the fall or on the first lift after the pause. Set the drag so a fish can take line: hamour's first run goes straight into structure, and a locked drag either pulls the hook or breaks you off.
Current separates a real drift from a boat ride. The window around a tide change, first light, and the last hour before sunset are the reliable ones. Season matters too. Fish are more aggressive in warm water and slower and deeper when it cools, so adjust depth and patience, not the jig. Before leaving the dock, read sea state and wind: a stiff north wind swings the boat and stands the line off vertical, and the presentation is gone. B7R gives you the Shuwaikh and Shuaiba tide tables, live sea state and a fish guide in one place, so the call happens before the trailer moves.
Log every drop that produced: depth, weight, current direction, jig type. After a few trips a pattern appears โ the difference between catching and cruising. Paper works, but a phone log gives the same conditions back without relying on memory.
Vertical jigging does not need complicated gear โ just patience and a jig that reaches the right spot. Try it, log it, then return to the same mark on the same tide. B7R is free on Google Play: https://play.google.com/store/apps/details?id=com.q8dm.b7r