Garmin GPS - Chart datum for Bluechart tides

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Chart datum for Bluechart tides

Beans

2008-01-30, 4:33 am

Hi,

Does anyone know what chart datum is being used for the Bluechart tides? I
have noticed a difference between the Bureau of Meteorology tide heights and
those predicted by Bluecharts. The difference does not seems to be
consistent.

Urangan 26/1/08
BOM Bluecharts
Time Ht Time Ht
04:50 0.81 4:52 0.60
11:06 3.63 11:05 3.42
17:38 0.91 17:33 0.70
23:29 3.07 23:07 2.91

Brisban Bar 30/1/08
BOM Bluecharts
Time Ht Time Ht
02:42 1.83 2:37 1.84
08:47 0.97 8:46 0.94
14:26 1.69 14:22 1.69
20:58 0.67 20:50 0.63

Any information will be appreciated.

Regards.

Sean

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