USING ADVANTAGE FOR HALIFAX RACE AND MARION-BERMUDA RACE

    RESULTS & ANALYSIS OF 2007 MARION-BERMUDA RACE   CLICK HERE

    RESULTS & ANALYSIS OF 2008 NEWPORT-BERMUDA RACE            CLICK HERE
    RESULTS & ANALYSIS OF 2006 NEWPORT-BERMUDA RACE            CLICK HERE
Download an ADVANTAGE DEMO with practice data for the Halifax and Marion-Bermuda Races. The Bermuda data includes our Gulf Stream currents and wind forecast for the 2006 Newport to Bermuda race. The download is the complete ADVANTAGE program for Halifax, including the 2009 Local Knowledge current model for the Gulf of Maine, and also includes charts and currents for the Marion Race (both local Block Island and Gulf Stream).  Use the included wind-prediction files to try out the program. You have 30 days to decide whether to buy. For quick and easy learning, download the ADVANTAGE Tutorial (open in your web browser).

For more information about Advantage, and to get DEMO,   CLICK HERE.

GULF STREAM CURRENTS FOR THE MARION-BERMUDA RACE

In 2007 we developed Gulf Stream currents for the Bermuda 1-2 Race, shown below. New data is processed for each race in the Gulf Stream, but this is a very typical result. Our tidal-current models are for the whole year.
berm1207.gif (250482 bytes)

EXAMPLES FOR THE MARBLEHEAD - HALIFAX RACE

Tidal currents off the southern tip of Nova Scotia. Advantage comes with current data for the calendar year. The image at left shows one option to display current (box showing magnitude and streamer for direction). The user can add more display points anywhere on the chart (yellow boxes). The image at right shows the optional vector display. With this option the program automatically displays current vectors with even spacing. To see more local detail, just zoom in on the region.
novacur1.gif (243054 bytes) novacur2.gif (242972 bytes)
Optimal routing from Marblehead to Halifax, to show effect of current alone. Wind was taken to be constant at a 10 knot headwind (tacking scenario). Under this assumption no additional distance is sailed when the boat tacks back and forth within the boat's tacking angles, and the optimal route is that which takes best advantage of the current. The optimal (red) route takes a bit under 59 hours (the computation used Benetau 40.7 polars), and the comparison routes (other colors) range up to 6 hours slower (yellow route).  Over the time it takes to complete the route, the boat will experience a number of tidal cycles, all included in Advantage's tidal-current model for the region. Compare to next image, which used a wind file.
halconw.gif (253466 bytes)
Optimal routing from Marblehead to Halifax, integrating both tidal-current and a wind-prediction file. The predicted wind was substantially greater than 10 knots, on the average, and more on the beam, but varied from location to location and over time. The boat is able to sail a reach for most of the way across the Gulf (straight portion of red line), and can complete the optimal route in just 38 hours.  There is no way to predict the wind forecast much in advance, so this is a calculation that needs to be performed immediately prior to the start, and repeated from actual position during the race.
halmodw.gif (255835 bytes)
Long-range wind file has a resolution of one data point every 0.5 deg (a very good resolution for a multiday race). Short-range, very high resolution wind file for the start (off Marblehead), has 4 x the resolution of the longe-range file.
halbig2.gif (245063 bytes) halfine2.gif (247267 bytes)

EXAMPLES FOR THE MARION-BERMUDA RACE (DATA FREE WITH PURCHASE OF ADVANTAGE)

Optimal routing from Buzzard's Bay tower to NE approach to Bermuda. The blue streamers show Gulf Stream from 2006 Newport-Bermuda Race (these are spaced evenly for visibility and do not reflect the much higher-resolution of the underlying current model). This example again assumes a constant headwind of 10 knots, to show the effect of current alone. The strong current leads to differences of up to 15 hours between the optimal (red) route (easternmost), and the westernmost (yellow) comparison route. This shows the difference of going with, as opposed to against, a current approaching 4 knots.
bermconw.gif (141804 bytes)
Optimal routing with wind-prediction file from 2006 Newport-Bermuda Race (compare to above). The black vectors show the wind pattern as the boat approachs the middle of the route (black dots show predicted boat position on each route, and right-hand column of box shows distance to destination from that point). While current is important, it must be factored in with the latest wind forecast, and there is no way to take the current distribution and attempt to plan your routing in advance of the race. We supply the latest wind and current forecasts the day of the race - the only predictions that count, and the software that enable you apply them to the characteristics of your boat and compute an optimal route in seconds.
bermmodw.gif (143609 bytes)

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