Where or does anyone know where I can find the lunitidal interval for...?

Question

... the Calabash River area. Calabash is the last town in Brunswick County, NC on the coast.

The Latitude is 33.89 N, and Longitude is 78.57 W, but the watch I have, I can only put in 78W, so I'm not sure if that makes a difference.

This is what I got right now. My GMT is -5.0, and I'm at 78ºW Long. So I got my lunitidal interval at 7:42.

I work at the fishing boats in Calabash, and the tide is off from my watch.

Did I do the lunitidal interval correctly? I copied the math from NOAA's website....

http://co-ops.nos.noaa.gov/faq2.html#22

Any help would be great,

Thanks

Answer 1

78.57 W is closer to 79 W than 78 W, so use 79 W on the watch if you can.

SUNSET BEACH PIER, ATLANTIC OCEAN, NC

HWI 12.24  Greenwich High Water Interval (in Hours)

LWI  6.11  Greenwich Low  Water Interval (in Hours)

Local Interval = GI - (0.069 * L)

For high water interval

LI = 12.24 - (0.069 * 78.57)

LI = 6.81867

For low water interval

LI = 6.11 - (0.069 * 78.57)

LI = 0.68867