Sea Surface Temperature And Surface Pressure Layers; Surface Pressure Patterns - Raymarine LIGHTHOUSE 4 Operation Instructions Manual

Lightning
The shade of the lightning symbols represent the time the lightning strike
was detected.
0 to 5 minutes ago 5 to 10 minutes ago
The lightning layer can be enabled and disabled from the [Weather layers]
menu: [Menu > Weather layers > Lightning].
17.9 Sea surface temperature and Surface
pressure layers
The Sea surface temperature layer uses color coding to identify water
temperature. A legend is available that can be displayed onscreen to aid
identification of sea surface temperature. The Surface pressure layer uses
standard pressure patterns and Isobars to identify surface pressure.
The legend can be enabled from the main menu: [Menu > Show legend].
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The sea surface temperature layer can be enabled and disabled from the
[Weather layers] menu: [Menu > Weather layers > Sea surface temperature].
When the sea surface temperature layer is enabled the transparency of the
layer can be adjusted using the [Visibility] setting: [Menu > Weather layers >
Sea surface temperature > Visibility].
The Surface pressure layer can be enabled and disabled from the [Weather
layers] menu: [Menu > Weather layers > Surface pressure].
10 to 15 minutes ago

Surface pressure patterns

The Surface pressure layer uses standard meteorological patterns to
represent surface pressure conditions.
Symbol Description
High / low pressure (Blue and Red)
Warm front (Red)
Cold front (Blue)
Occluded front (Purple)
Stationary front (Red-Blue)