Savvy Chart™ Legend
Here is an explanation of the symbols, lines and areas shown on the Savvy Chart™. Many of these are standard nautical chart symbols as specified in S-57. Where the symbols on Savvy Charts are different they are explained here. Selecting a symbol on the Savvy Chart™ will bring up more detailed explanation such as the flashing sequence of illuminated buoys.
Buoys
There are two lateral marker systems globally IALA-A is rest of the world and IALA-B is in Americas, Caribbean, Japan, Philippines & Korea. It is important to know which region you are in as the lateral buoy and preferred channel colours are reversed. IALA-A is Port : Red, Starboard : Green. IALA-B is Port : Green, Starboard : Red. The top marks are the same in both systems Port : Can, Starboard : Triangle.
North Cardinal
Pass to the north side of this mark
South Cardinal
Pass to the south side of this mark
East Cardinal
Pass to the east side of this mark
West Cardinal
Pass to the west side of this mark
Lateral Marker
IALA-A port lateral marker
Lateral Marker
IALA-A starboard lateral marker
Lateral Marker
IALA-B port lateral marker
Lateral Marker
IALA-B starboard lateral marker
Illuminated Buoy
Shape added to buoy indicates light, select on chart to see colour & sequence
Special
Indicates a special area or feature select on chart for details
Safe Water
Safe navigable water around the marker
Isolated Danger
Marks danger with navigable water around it
New Danger
Indicates new danger not yet published in nautical documents
Lightship
Lightship colour and top marks vary
Barrel Buoy
Large buoy, colour can vary, select on chart for details
Superbuoy
Very large buoy, colour varies, select on chart for details
Depth
Drying
Charted depth drying mud or land
0 - 2 m / 0 - 6.5 ft
Chart value depends on unit settings
2 - 4 m / 6.5 - 13 ft
Chart value depends on unit settings
4 - 10 m / 13 - 33 ft
Chart value depends on unit settings
10 - 12 m / 33 - 39 ft
Chart value depends on unit settings
12+ m / 39+ ft
Chart value depends on unit settings
Obstructions
Underwater Obstruction
Submerged hazard
Rock Submerged
Rock below surface
Rock Awash
Rock that may be showing depending on conditions
Mooring Point
Pier or jetty for mooring craft
Dangerous Wreck
Dangerous wreck do not approach
Wreck
Non-dangerous submerged wreck
Wind Turbine
Wind turbine position do not approach
Fish Farm
Fish pens or nets do not approach
Shellfish Bed
Shellfish bed do not approach or anchor
Chart Areas
Poorly Surveyed
Area of chart with low quality survey data
Locked Area
Locked area requires subscription
Windfarm
Windfarm do not enter
TSS Separation Zone
TSS separation zone, small craft cross at right angles
TSS Lane
TSS lane, small craft cross at right angles
No Entry
Prohibited area do not enter, not all prohibitions may apply
Do Not Anchor
Do not anchor in this area
Turbulent Area
Dangerous sea turbulence due to tidal rip or overfall
Chart Symbols
Marina
Marina select on chart for details & services
Anchorage
Boat Ramp
Not all ramps shown are public
Protected Sea Area
An area where certain activities are restricted or prohibited in order to conserve marine habitats and biodiversity
Tidal Station
Station used to measure tidal heights
Tidal Stream
Shows direction and strength of tidal flow
Tower
Visible tower landmark
Thin Tower
Visible thin tower landmark
Lattice Tower
Visible lattice tower landmark
Transmission Tower
Visible transmission tower landmark
Transmission Mast
Visible transmission mast landmark
Receiver Dish
Visible receiver dish landmark
Chimney or Smokestack
Visible chimney or smokestack landmark
Obelisk or Monument
Visible obelisk or monument landmark
Landmark
Visible distinct structure or building
Flag
Visible flag, colour may vary
Bridge or Overhead Clearance Height
Bridge or overhead obstruction clearance height shown in current units
Overhead Power Cable
Overhead live cable normally between pylons, normally combined with height clearance
Overhead Cable
Overhead line or cable, normally combined with height clearance