Why does Nortek have two systems at almost the sam
by
Paul
—
last modified
Jan 17, 2005 07:03 AM
| Quote |
| Nortek sells vessel mount systems with frequencies of 500 kHz and 1.5MHz, but also at 600kHz and 1MHz. What are the differences, and which should I choose? |
Nortek started its life in 1996 with a product line called the NDP. New software was developed to allow this product to be used on vessels with good GPS systems. This product came with a choice of two frequencies. 500kHz with a range of 70-100m and 1.5 MHz with a range of 15-30m (depending on conditions)
In 1999, Nortek released a new product, based on its new hardware platform the AWAC was a current and wave measuring system, built into a plastic housing, which integrated all the modern technology into a compact design. A few years later the software for the NDP was re-released to work with the AWAC. A new feature that was written into the AWAC firmware was bottom tracking, an algorithm where the speed of the bottom (relative to the vessel) is measured, and the movement of the vessel is therefore detected. This improvement gave smaller, more erratic vessels, the possibility to use the system without the need of very expensive navigational systems.
The AWAC has been designed for 600kHz with a 50m range and 1 MHz (25).
The AWAC is also available in bronze for permanent vessel mountings.
For most applications the NDP technology has been succeded by the AWAC. The AWAC is a more sensitive and user friendly device. However a large number of vessels around the world have VM-NDP systems installed and so Nortek is keeping the VM-NDP alive to serve the customers that are using this product.
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