Drag is the part of the reel that decides how much force a fish feels before line starts leaving the spool. Too tight and something gives: the knot, the hook, or the line. Too loose and you cannot set the hook or turn a fish away from structure. Setting it well takes two minutes and one small tool.
It is also not a set-and-forget adjustment. Heat, water, salt, and wear all change how the drag behaves. Check it at the start of every trip.
Drag resists the spool turning. When a fish pulls, line leaves the spool at a set force before the full load reaches the line. In practice, the drag is a safety valve between the fish and your line.
The tighter you set it, the more load lands on the line, knot, and hook. The looser it is, the harder it becomes to stop a fish or lift it away from rocks.
The common starting point among anglers is a drag setting of roughly 25 to 30 percent of the line's breaking strain. On 20 lb line that is about 5 to 7 lb of drag.
That is a starting number, not a rule. Current, structure, and the species you expect all shift the decision. Around rocks or in strong current, a little more drag helps you control the fish. In open water you can run lighter.
The accurate way is a small spring or digital scale on the line. The process:
No scale? Pull line off by hand, slowly, and feel where it starts to give. It is less precise, but far better than guessing.
A star drag is adjusted with the small star wheel on the side plate. It is quick, simple, and the most common setup for shore and small-boat fishing.
A lever drag uses a lever to set a range and lets you make fine changes while fighting a fish. It takes some getting used to, because the lever has to sit in the right position before you load it.
The first is locking it down so nothing can escape. That is the fastest way to break line or bend a hook. The second is leaving it slack all day, so the hook never sets properly.
The third is skipping the rinse. Salt and grit get into the washers and make the drag grab and stutter. Rinse the reel with fresh water after each trip without dunking it, and have the washers checked periodically.
The fourth is never rechecking during the day. Heat and water change the feel, so test it again once conditions shift.
The catch log in the app lets you record species, spot, and time, then look back at what worked. The B7R app keeps the whole trip in one place, from tide times to your own records.
Check your drag by hand before the next trip. To log your sessions and check sea state and tides, download B7R on Google Play.