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  1. Why is the DST110 Speed Through Water (STW) reading different from the Speed Over Ground (SOG) reading? Speed Over the Ground (SOG) is the speed of the vessel relative to the surface of the earth. Speed Through Water (STW) is the speed of the vessel relative to the water. It is possible for the STW to be zero while the SOG is 5 knots, for example if th... Read More
  2. Why is the GPS100 Speed Over Ground (SOG) reading different from the Speed Through Water (STW) reading? Speed Over the Ground (SOG) is the speed of the vessel relative to the surface of the earth. Speed Through Water (STW) is the speed of the vessel relative to the water. It is possible for the STW to be zero while the SOG is 5 knots, for example if th... Read More
  3. Why does the heading coming from the SSC200 appear to be in error? The SSC200 measures the Earth's magnetic field and before it will provide an accurate heading, it must understand how the Earth's magnetic field is affected (or deviates from normal) due to the ferrous metals found on the vessel. Fortunatel... Read More
  4. Why is the WSO100 wind direction incorrectly displayed on my display? The WSO100 will not show the correct wind direction if it hasn't been aligned with the boat. You align the WSO100 in one of two ways:align the post (there are three posts attaching the top of the WSO100 to the base) closest to the humidity senso... Read More
  5. What is the difference between true wind referenced to ground speed and true wind referenced to water speed? True wind is computed by subtracting the vessel speed from the apparent wind. The vessel speed is either referenced to the water (Speed Through Water (STW)) or the vessel speed is referenced to the ground (Speed Over Ground (SOG)). If the STW is subt... Read More
  6. What is ground wind? Ground wind is the speed and direction of the wind referenced to a compass rose, which is different from apparent and true wind which are referenced to the bow of the boat. The apparent and true wind are interesting to see how the wind is affecting o... Read More
  7. What is true wind? True wind is what the wind is truly doing and it can be computed from the measured apparent wind by subtracting the vessels speed. For example, if the vessel was moving at exactly 5 knots and the wind was blowing in the exact opposite direction at 5 ... Read More
  8. Why doesn’t Maretron offer a WSO100 with a built in GPS or compass? The WSO100 is generally placed at the highest point on the vessel so that it is not obstructed from the wind. Unfortunately, the highest point on a vessel is often the worst possible placement for a GPS or compass. Take for example a GPS mounted at t... Read More
  9. What accessories can I order for the TLM100 and which one should I use? The following accessories are available for the TLM100.TA-5H-1.25BSP   1.25" BSP Displacement Hull Tank Adapter TA-5H-1.5NPT    1.5" NPT Displacement Hull Tank AdapterA focus tube(TFT) can help technicians control the ultrasonic signal path generated... Read More
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