A more accurate system was developed using signalling in the 1.6 MHz range, named Hi-Fix, was used for specialised applications such as precision measurements involved with oil-drilling, etc.. Other systems were used in the Middle East.
A more accurate system was developed using signalling in the 1.6 MHz range. Other systems were used in the Middle East the 1.6 MHz range. The 1.6 MHz range was named. Hi-Fix, was used for specialised applications such as precision measurements. These precision measurements were involved with oil-drilling, etc..