Mobile Crossing WayPoint Map Loader Instrukcja Operatora Pobierz pdf (Strona 26)

The versions of this program before 5.0 only used calculation method 3. Examine the government (DMA) tables for

your area and see if all of the ASF factors are more or less the same over the area. This technique does very well in

some areas and insures that even waypoints far from the calibration waypoints are adjusted. If the ASFs vary

considerably over the coverage area, then consider splitting up your files to cover smaller areas that can have the same

ASF over that area.

The Calibration selection screen has a button that allows you to examine the ASFs of both the government and user

calibrated tables for your area. This will better inform you as to the ASF values that will be used and to give you a feel

for the variability of the values over your area. In some areas, the ASF values are very uniform across the area and a

single value will be a good choice. In other areas, the ASF values vary widely from place to place and you will be much

better off using the calibrated tables. The example below shows one such area where the values are not uniformly

distributed. The tables are in 5-minute increments (5 minutes is about 5 nautical miles). This table shows a jump from

0.47 to 0.56 microseconds in just 5 miles. That’s a potential error of over 100-ft if the same ASF is used for both areas.

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Mobile Crossing WayPoint Map Loader Instrukcja Operatora Strona 26