The Sonar Potion is a buff potion which grants the Sonar buff when consumed. When Fishing while under the effects of the potion, the name of what you will catch will appear above the lure when it is bitten. The name will not be shown however, if the item pickup text is disabled in Settings. This lasts for 4 minutes, but can be cancelled at any time by right-clicking the icon. This potion is especially useful as it allows the player to not waste bait on unnecessary fish as the cast can be left in the water until another fish bites at the line.