Navigation I Nau 100 Lab
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NAU 100
Lab #10 – Answer Key
Tides, Running Fixes, Estimated Positions, Wheel-over Points, Turn Bearings
Name: ____________________ Date: _____________
Section: __________
The following exercises are to be done using chart 12354 TR.
You are on a voyage from Stratford, Connecticut to New London. Your draft is 18 feet and your
air draft is 32 feet. Variation in your area is 13°W and the gyro error is 1°E.
Part A – Tides
1. You intend to depart Stratford at 2300 on 22 May 1983. Use the 1983 Tide Tables to
predict the height of tide at that time.
a. Step 1: Determine the index number for Stratford.
Index number: __1231__
b. Step 2: Using table 2 of the Tide Tables, determine the time and height
differences at Stratford.
Time
Height
Station:
High Water
Low Water
High Water
Low Water
Stratford differences
+ 0 27
+ 0 59
-1.2
0.0
c. Step 3: Determine the reference station that Stratford is subordinate to.
Reference station: __Bridgeport__
d. Step 4: Using table 1 of the Tide Tables, determine the time and height of the
high and low tides that surround the desired time at the reference station.
Remember daylight saving time!
Time
Height
Station:
High Water
Low Water
High Water
Low Water
Reference station
2101
0325
7.3
-0.4
tides
e. Step 5: Using the information collected above, determine the time and height of
the high and low tides at Stratford.
Time
Height
Station:
High Water
Low Water
High Water
Low Water
Reference station
2101
0325
7.3
-0.4
tides
Stratford differences
+ 0 27
+ 0 59
-1.2
0.0
Stratford tides
2128
0424
6.1
-0.4
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