Datums for 9457512, Sitkalidak Island GPS Tide Buoy AK

Data Quality Data from this station was collected using methodology that does not meet CO-OPS highest level of accuracy (no more than 10 cm, 95% Confidence Interval (CI) referenced to a tidal datum). Recognizing that lower quality data can be used for certain applications CO-OPS is making this data available to its users with restraint. The average six-minute water level observations derived from this system have an accuracy ranging from 10.0 - 30.0 cm, 95% CI on datum. Users are cautioned to consider the accuracy of these data before using them for critical navigational or coastal engineering purposes.
NOTICE: All data values are relative to the MLLW.

Elevations on Mean Lower Low Water

Station: 9457512, Sitkalidak Island GPS Tide Buoy, AK
Status: Accepted (Jun 18 2018)
Units: Feet
Control Station: 9457292 Kodiak Island, AK
T.M.: 135
Epoch: 2012-2016
Datum: MLLW
DatumValueDescription
MHHW8.18Mean Higher-High Water
MHW7.57Mean High Water
MTL4.35Mean Tide Level
MSL4.34Mean Sea Level
DTL4.09Mean Diurnal Tide Level
MLW1.13Mean Low Water
MLLW0.00Mean Lower-Low Water
NAVD88
STND-42.65Station Datum
GT8.18Great Diurnal Range
MN6.44Mean Range of Tide
DHQ0.61Mean Diurnal High Water Inequality
DLQ1.13Mean Diurnal Low Water Inequality
HWI10.36Greenwich High Water Interval (in hours)
LWI4.08Greenwich Low Water Interval (in hours)
Max TideHighest Observed Tide
Max Tide Date & Time Highest Observed Tide Date & Time
Min TideLowest Observed Tide
Min Tide Date & Time Lowest Observed Tide Date & Time
HAT10.22Highest Astronomical Tide
HAT Date & Time11/24/2003 22:06HAT Date and Time
LAT-2.59Lowest Astronomical Tide
LAT Date & Time11/25/2003 05:00LAT Date and Time
Tidal Datum Analysis Periods
06/26/2016 - 07/25/2016


Products available at 9457512 Sitkalidak Island GPS Tide Buoy, AK
  • Meteorological/Other
  • Meteorological Observations
  • Water Temp/Conductivity
  • PORTS®
  • This station is not a member of PORTS®