Mobile Crossing WayPoint Map Loader Manuale dell'Operatore Scaricare il pdf (Pagina 75)

SeaMarks manual VI. Menu Reference •

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• 75

There is some overlapping coverage between the Northeast chain (9960) and the Southeast Chain (7980). South of Cape

Fear, N.C. to Brunswick, Georgia, 9960X and 9960Y can be used offshore. Closer inshore from Cape Fear to St.

Catherine's Island, GA., 7980Y and 7980Z is the preferred pair.

SOUTH FLORIDA AND THE GULF COAST

From Fort Lauderdale around to Cape Sable the preferred pair is 7980W and 7980Z For the Keys, most people used

7980W and 7980Y. The pair 7980W and 7980Y provide the most reliable coverage along the entire west coast of

Florida from Cape Sable to Panama City.

From Panama City to Mobile, Alabama, the preferred pair is 7980X and 7980Y.

In the western Gulf of Mexico from Mobile to Grangeville, Louisiana, the preferred pairs are 7980W and 7980X. From

Grangeville to Brownsville Texas, the preferred pair is 9610Y and 9610Z. You may find data taken in non preferred

pairs, but it will have less accuracy.

THE US WEST COAST

5990Y and 5990Z is the preferred pair from the Canadian Border along the Washington State Coast down to about 44

degrees latitude (along the Northern Coast of Oregon). 5990X and 5990Z give a strong fix further off the Washington

and Oregon Coast.

Off the southern portion of the Oregon Coast and the extreme northern portion of the California coastline, 9940W and

9940X provide the best intersections.

9940W and 9940Y are the preferred pair along the northern California Coast to just below San Francisco. 9940X and

9940Y is the best pair off the coast of southern California.

HAWAII

4990X and 4990Y is the preferred pair for all central Pacific islands.

OBSOLETE CHAINS

If you have really old data, it is possible that the waypoints are from a now obsolete chain. For example, from 1966 to

1978, the East and South East US was covered by the 9930 chain. Data on this chain is available in the program and it

can be converted to Lat/Lon. Some other obsolete loran C chains are lost in antiquity and insufficient data is available

for them.

You only need a small subset of the Loran station data to use. Most users need only one station chain (pair) and some

need several. You can choose up to 8 chains to work with at any one time. If you are only using GPS, you might select

some Loran chains anyway, as you may need them sooner or later. For example, many users get lists of Loran waypoints

from friends, retiring captains, or off the Internet. If you are unsure as to which Loran chain pairs to use, push Suggest

and the program will suggest some for you based on your center Lat/Lon. Alternatively, you can ask someone more

familiar with Loran, check the graphics on our web site, or call us.

If you are not planning to use obsolete Loran chains or more than one Loran system, you can use just the suggested

chain choices. If you choose Suggest, you will be presented with the closest Loran system and asked to approve it. A

system is for example: "9940, US West Coast". Loran station systems are also referred to by their Group Repetition

Intervals (or GRIs) such as 9940. If the suggested choice is not the one you want, push NO and the routine will pick the

next nearest system. If all suggested choices are wrong, you probably have the wrong center Lat/Lon. If all else fails or

you need special combinations, you will need to do custom chain selection. Special combinations occur if you are in an

area served by two Loran chains such as in North Carolina. The Cape Fear loran station serves both 7980 and 9960

systems.

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Mobile Crossing WayPoint Map Loader Manuale dell'Operatore Pagina 75

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