HP-67/97 TIDES CALCULATIONS

[plore90]

Calculate the tide height in meters at a given time tf(hh:mm) for a Secondary Port knowing the tidal data of the Main Port.

Main Port:
Low Tide t = 13:47 h = 0.60 m
High Tide t = 19:54 h = 4.55 m
Secondary Port: Corrections
Low Tide t = -00.05 h = +0.10 m
High Tide t = -00.20 h = +0.25 m
Secondary Port Pa = 1003 ePascal

1> Step : 13.47 STO1
0.60 STO2
19.54 STO3
4.55 STO4
P<>S
-00.05 STO6
+00.10 STO7
-00.20 STO8
+00.25 STO9
P<>S
2> STEP : READ PROGRAM CARD HP6797 TIDES_SPORT.hp97
I have the Tide data loaded with the sequence Low Tide -> High Tide
then I press the B key
I get the Tide data for the Secondary Port
3> STEP : I load the Atmospheric Pressure of the Secondary Port (1003) because it is different from the standard value 1013

1003 STOI

4> STEP : I have the Tide data of the Secondary Port with the sequence Low Tide -> High Tide
so for the calculation required by the problem

READ PROGRAM CARD HP6797_TIDESBABA.hp97
I insert the desired instant tf(hh.mm) in the R9 register
ie. 16.10 STO9
then I press the A key
I get the value of the height of the corresponding Tide without atmospheric correction x= 2.26 m
I have a value in the I register different from 0.00
then I press the B key to obtain the correct value of the height of the tide at that Pa
i.e. x= 2.36 m.

If I have to calculate the instant tf at which I have a given height, I have to repeat the same STEP 1 and 2,
then I skip to step 4 and I go to read the magnetic card, this time, HP6797_TIDESHTBA.hp97
I store the height provided h in meters, in the register R0 (h STO0) and then I press the A key, obtaining the value of tf(hh.mm) requested.

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