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NOAA Current and Wind
Forecast Guidance data
(sim run )

XTide predicts .
are the average ebb/flood directions
click a to compare with XTide

(click or drag on graph to change)
Observed current:
   Current predicted by NOAA Operational Forecast System (OFS)
Ebb&Flow scale:
3 kts
this station
Observed current. Speed and direction from NOAA CO-OPS server.
Harmonic station. Speed and direction from NOAA CO-OPS server.
Subordinate station. Speed from XTide, at mean ebb or flood direction.
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Details Editor

cursor coordinates (entered manually):
distance guide radius:

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Title (required):

Chart Title (optional, for BASK printed charts):





Contact Info:

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Coordinates: ,

(click on a tide or current marker to change,
or click here to remove)

NOAA Marine Forecast Zone:

  • Details Editor Help


Track Measurements
Full Path    

Path Latitude, Longitude

Add a point to the track

Measuring distance along a track

Follow the instructions below to draw a track on the map. The distance along the track, the coordinates of the endpoints, and the compass direction between the endpoints will appear in the table above as you draw.

Note: If your system does not have a hardware keyboard, some of the instructions below refer to keystrokes like Shift, Delete/Backspace, etc. which are not available to you. In most cases we describe an equivalent gesture which doesn't require a keyboard.

Start drawing by clicking anywhere on the map. If you're using a mouse or trackpad, a rubber-band line will follow the cursor as you draw. The "from" end of the line is indicated by a large dot, and the "to" end is indidated by an arrowhead. Tickmarks along the track are spaced every mile, kilometer, or nautical mile, as selected in the table above.

  • Click to add another point.
  • To delete the last point while you're drawing, either type Delete/Backspace, or click the symbol, which indicates the point to be deleted.
  • To trace a curved path, either click and hold until a translucent red circle appears around the cursor, or hold down the Shift key. Whenever the red circle is visible, points will automatically be added to the path as you move the cursor. To delete points, trace backwards over the symbol.
  • To finish the track, either double-click the final point, or type Enter/Return.
  • To finish the track without adding the current rubber-band segment, type Escape.

Once you've finished drawing the track, the rubber-band line disappears. You'll see solid white circles at all the bends, and translucent white circles between them.

  • To refine the track, drag any of the white circles. Dragging a solid white circle repositions an existing bend or endpoint. Dragging a translucent white circle creates a new bend.
  • To extend the track without moving any of the existing bends, drag either endpoint a short distance, release, and continue drawing. You may combine this with click and hold or the Shift key, as described above, to extend the track with a curved path.
  • To delete a segment of the track, double-click either the translucent white circle at its center or the solid white circle at its "to" end, or mouse over one of the circles while holding down the Delete/Backspace key.
  • To delete the last segment of the track, press the Delete/Backspace key while the cursor is not on the track.
  • Click the Start Over button, or double-click anywhere outside of the track, to erase the current track and start a new one.

Track distance and direction, and the coordinates of the track endpoints, are shown in the table above.

Distances can be shown in miles, kilometers, or nautical miles, as specified by the selector under Distance in the table header.

Course measurements can be shown as either magnetic or true, as specified by the selector under Course in the table header. The magnetic correction is calculated for the first point of the track, using the NOAA online calculator. The same value is used for all points.

Coordinates can be shown in either of two formats, as specified by the selector under Latitude, Longitude in the table header:

  • decimal degrees
  • deg° min' sec": degrees, minutes, and seconds

In addition to the data in the table, a popup on the map also displays the distance along the path, the coordinates of a point on the path, and the length and compass direction of a segment of the path. You can enable or disable this popup using the Show Info checkbox, or by pressing the I key. To show the length and compass direction of a segment other than the last, click the white circle of its endpoint or midpoint.

Working with Coordinates

If you want to know the latitude and longitude of a point on the map, just hover the cursor over it. The coordinates will appear in the From box of the table, and, if you have the Show Info checkbox checked, in the Info popup. Or (e.g. on a touch-screen device), just click the point. It will be drawn on the map as a zero-length track, and its coordinates will appear in the table.

If you have coordinates of a point and you want to see where it is on the map, enter them in the Add a point to the track box. The point will be drawn on the map as a zero-length track. You may enter coordinates in any of the three formats described above, regardless of which format you have chosen in the selector. At any time, you may use the Add a point to the track box to manually enter a coordinate instead of clicking a point, or you may click the Add my location button to add a point for your current physical location.

Note: To use the Add my location button, you must set privacy preferences in both your OS and your browser to allow bask.org to access your location. You will be prompted to do so if necessary.

If you switch to another tab (e.g. Tides or Weather) the track will temporarily disappear from the map, but it will come back again when you switch back to the Measure tab.

Click here for a quick video introduction (Jan 2024)

Auto-Help: When you interact with Trip Planner controls (e.g. click a button), the relevant sections of this Help text will be highlighted in yellow.

The Trip Planner has two main sections: the Map and the Info Panel. In a desktop or tablet browser, the Map is on the left and the Info Panel is on the right. In a mobile phone browser, only the Info Panel is visible at first. The Help text that you are reading now is in the Info Panel.

Tapping the Map button near the upper-right corner of the Info Panel switches to Map View, in which only the map is visible. From Map View, tapping the blue button in the upper-right corner brings back the Info Panel.

Click on any item below to read more about it.

  • Map

  • Info Panel

  • Need More Screen Space?

  • Keyboard Shortcuts

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