FURUNO TZTXL - When You're Serious

Using Chlorophyll Levels, Sea Surface Temperature and Sea Surface Height to find productive gamefish grounds has reached another level.

Modern anglers have access to powerful ocean data that helps locate productive fishing areas faster than ever before. There's dozens of smartphone apps and websites to scroll through for oceanographic data but Furuno's TZTXL Multi-Function Displays brings this important data directly to your fingertips. No need to chop and change between different phone apps and subscriptions whilst struggling to align the app data with navigating your plotter. Furuno's built-in weather app offers subscription free oceanographic and weather data, downloaded directly to your TZTXL plotter.

Three of the most important factors to watch are chlorophyll concentration, sea surface temperature (SST) and sea surface height (SSH) - all of which reveal where tuna, marlin, and other pelagic fish are most likely to feed.

FURUNO TZTXL - Chlorophyll levels shown with colour overlay and contours

Once downloaded to your TZTXL, simply pick the most productive areas where chlorophyll edges, temperature breaks and SSH changes align for prime hunting grounds where baitfish has gathered and predators actively feed. Tap the GOTO button and the TZTXL will guide you to the most productive fishing grounds based on the latest oceanographic data.

Using the CUSTOM PRESET feature to customise the oceanographic information

Chlorophyll represents microscopic phytoplankton, the foundation of the ocean food chain. Where plankton is present, baitfish will follow, and predators won’t be far behind. The most productive areas are typically found along chlorophyll edges where clean blue water meets greener, nutrient-rich water. For tuna and gamefish, the ideal chlorophyll range is generally 0.15 to 0.35 mg/m³. Water that is too clear may lack bait, while water that is too green can be dirty, low in oxygen, and poor for hunting.

Sea Surface Temperature - SST adds another layer of insight. Tuna and billfish prefer temperatures between 18°C and 26°C, depending on species. Yellowfin typically favour 20–24°C, bigeye tolerate cooler water, and marlin often hunt along warmer edges. When temperature breaks overlap with chlorophyll lines, these zones become highly productive feeding lanes.

Sea Surface Temperature (SST)

Sea Surface Height - SSH is a less-known but equally valuable indicator. SSH reveals ocean currents, eddies, and upwellings. Higher or lower sea levels often signal moving water, which pushes nutrients and baitfish into concentrated areas. Rising water (warm-core eddies) may hold baitfish offshore, while lower SSH (cold-core eddies or upwellings) pulls nutrients upward, creating rich feeding zones. Tuna frequently position along these current boundaries because they deliver a constant food supply.

When it all comes together - SSH, Current and SST. Customisable PRESET for your preferred data

When chlorophyll edges, temperature breaks and SSH changes align, anglers are seeing prime hunting grounds—areas where prey is gathered and predators actively feed.

Check out our Facebook Page for TZTXL Weather App in action

For more information, contact our Sales Team: sales@taylormarine.co.za

Taylor Marine SOUTH AFRICA is the exclusive Furuno National Distributor (FND) for South Africa. Purchase through our authorised distribution partners by visiting Furuno Fishing Fanatics - ZA