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Old 07-11-2013, 06:07   #1
Registered User

Join Date: Nov 2013
Posts: 10
Harmonic Wizard Needed

Hello Forum members, let me 1st introduce myself.
I am Terry from the UK and have come across this forum several times looking for answers to my ever more confusing tide prediction problems.

I suppose it gets to a point when one must ask for help.

My problem is this.

I am a Linux user and have currently written a script for use with David's excellent Xtide program.
All seems to be great apart from I am missing several reference stations that I require.
Those familiar with the software, I have used tcd-utils to restore_db and can see the harmonic data in plain text.
However, I require to enter data that is another format to the one which xtide uses.

The data I have found from an old wxtide harmonics file looks like the following.

Brest, France
01:00 :Europe/Paris
13.192703 feet
J(1) 0.009 123.5
K(1) 0.206 90.8
K(2) 0.692 175.2
L(2) 0.219 133.3
M(1) 0.000 0.0
M(2) 6.682 137.3
M(3) 0.065 58.9
M(4) 0.190 161.0
M(6) 0.095 81.3
M(8) 0.006 0.4
N(2) 1.364 118.1
2N(2) 0.183 101.8
O(1) 0.213 343.2
OO(1) 0.000 0.0
P(1) 0.075 83.2
Q(1) 0.065 295.9
2Q(1) 0.000 0.0
R(2) 0.000 0.0
S(1) 0.059 11.8
S(2) 2.457 177.5
S(4) 0.000 0.0
S(6) 0.000 0.0
T(2) 0.134 166.0
LAMBDA(2) 0.091 99.8
MU(2) 0.285 130.4
NU(2) 0.246 114.0
RHO(1) 0.000 0.0
MK(3) 0.000 0.0
2MK(3) 0.000 0.0
MN(4) 0.068 115.7
MS(4) 0.108 246.8
2SM(2) 0.062 335.0
MF 0.036 168.4
MSF 0.006 306.5
MM 0.009 200.7
SA 0.193 251.5
SSA 0.036 78.2

I have no idea how to start converting this into data that can be read by xtide, which has data like the following. I have tried for hours but always get errors building the database again

Brouwershavensche Gat 8, Netherlands
+01:00 :Europe/Amsterdam
1.4000 meters
x 0 0
K1 0.0738 0.73
K2 0.0847 126.36
x 0 0
x 0 0
M2 1.1077 67.80
x 0 0
M4 0.1641 134.98
M6 0.0870 106.49
M8 0.0226 173.71
N2 0.1794 41.11
x 0 0
O1 0.1135 186.32
x 0 0
P1 0.0364 347.96
Q1 0.0340 136.89
x 0 0
x 0 0
S1 0.0091 314.44
S2 0.2853 124.03
S4 0.0103 287.06
x 0 0
T2 0.0181 114.20
LDA2 0.0394 89.51
MU2 0.0910 187.38
NU2 0.0646 37.27
x 0 0
MK3 0.0171 298.02
2MK3 0.0180 153.72
MN4 0.0610 111.23
MS4 0.1075 191.02
2SM2 0.0282 2.45
x 0 0
MSF 0.0334 29.10
x 0 0
SA 0.0839 214.00
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
2MK6 0.0225 162.35
2MN2 0.0914 269.88
2MN6 0.0474 77.77
2MS6 0.0811 158.75
2NM6 0.0133 57.40
x 0 0
2SM6 0.0142 215.80
x 0 0
3MN8 0.0171 141.48
3MS2 0.0243 303.17
3MS4 0.0192 207.65
3MS8 0.0322 225.31
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
M10 0.0152 190.51
M12 0.0028 200.85
MK4 0.0329 194.94
MKS2 0.0067 253.42
MNS2 0.0211 164.35
x 0 0
x 0 0
x 0 0
x 0 0
MPS2 0.0169 129.30
MSK6 0.0088 225.40
x 0 0
MSN2 0.0212 338.09
MSN6 0.0159 138.51
NLK2 0.0334 6.59
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
SK3 0.0078 350.72
x 0 0
x 0 0
x 0 0
x 0 0
SO3 0.0090 229.46
x 0 0
x 0 0
x 0 0
x 0 0
2ML2S2 0.0154 338.06
SKM2 0.0132 1.69
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
NO3 0.0080 117.32
2MLS4 0.0184 274.59
x 0 0
x 0 0
x 0 0
MNO5 0.0077 144.50
x 0 0
MSK5 0.0036 49.39
3KM5 0.0012 242.74
2MP5 0.0067 258.39
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
2MNO7 0.0061 142.10
x 0 0
2MSO7 0.0067 251.81
x 0 0
2MSN8 0.0132 209.60
2(MS)8 0.0121 292.05
2(MN)8 0.0070 117.28
x 0 0
x 0 0
x 0 0
3MK8 0.0094 227.19
2MSK8 0.0075 295.32
x 0 0
3MNK9 0.0012 289.09
4MK9 0.0013 327.82
3MSK9 0.0021 351.53
4MN10 0.0138 159.07
3MNS10 0.0173 208.38
4MS10 0.0277 233.79
x 0 0
3M2S10 0.0161 288.16
4MSK11 0.0013 156.52
4MNS12 0.0055 205.78
5MS12 0.0064 234.47
x 0 0
4M2S12 0.0052 284.28
M1C 0.0127 120.63
3MKS2 0.0124 305.98
OQ2-HORN 0.0106 348.79
MSK2 0.0144 273.43
MSP2 0.0097 90.89
2MP3 0.0041 151.62
4MS4 0.0050 356.43
2MNS4 0.0093 193.53
2MSK4 0.0075 291.01
3MN4 0.0223 316.24
2MSN4 0.0171 21.24
3MK5 0.0117 181.94
3MO5 0.0087 344.97
3MNS6 0.0126 192.64
4MS6 0.0150 215.14
2MNU6 0.0173 67.96
3MSK6 0.0081 285.94
MKNU6 0.0043 132.92
3MSN6 0.0201 1.13
M7 0.0029 300.41
2MNK8 0.0062 201.47
2(MS)N10 0.0036 283.18
x 0 0
x 0 0

I have only a few ports that I need to add and build into my Harmonics.tcd file.

Any help in explaining and understanding this process would be greatly appreciated.
Any tools suggested to convert would also be very helpful to me.

Thankyou for your time

Terry
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Old 07-11-2013, 20:06   #2
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Posts: 1,743
Re: Harmonic Wizard Needed

Quote:
Originally Posted by crazydiamond View Post
Hello Forum members, let me 1st introduce myself.
I am Terry from the UK and have come across this forum several times looking for answers to my ever more confusing tide prediction problems.

I suppose it gets to a point when one must ask for help.

My problem is this.

I am a Linux user and have currently written a script for use with David's excellent Xtide program.
All seems to be great apart from I am missing several reference stations that I require.
Those familiar with the software, I have used tcd-utils to restore_db and can see the harmonic data in plain text.
However, I require to enter data that is another format to the one which xtide uses.

The data I have found from an old wxtide harmonics file looks like the following.

Code:
Brest, France
01:00 :Europe/Paris
13.192703 feet
J(1)	0.009	123.5
K(1)	0.206	90.8
K(2)	0.692	175.2
L(2)	0.219	133.3
M(1)	0.000	0.0
M(2)	6.682	137.3
M(3)	0.065	58.9
M(4)	0.190	161.0
M(6)	0.095	81.3
M(8)	0.006	0.4
N(2)	1.364	118.1
2N(2)	0.183	101.8
O(1)	0.213	343.2
OO(1)	0.000	0.0
P(1)	0.075	83.2
Q(1)	0.065	295.9
2Q(1)	0.000	0.0
R(2)	0.000	0.0
S(1)	0.059	11.8
S(2)	2.457	177.5
S(4)	0.000	0.0
S(6)	0.000	0.0
T(2)	0.134	166.0
LAMBDA(2)	0.091	99.8
MU(2)	0.285	130.4
NU(2)	0.246	114.0
RHO(1)	0.000	0.0
MK(3)	0.000	0.0
2MK(3)	0.000	0.0
MN(4)	0.068	115.7
MS(4)	0.108	246.8
2SM(2)	0.062	335.0
MF	0.036	168.4
MSF	0.006	306.5
MM	0.009	200.7
SA	0.193	251.5
SSA	0.036	78.2
I have no idea how to start converting this into data that can be read by xtide, which has data like the following. I have tried for hours but always get errors building the database again

Code:
Brouwershavensche Gat 8, Netherlands
+01:00 :Europe/Amsterdam
1.4000 meters
x 0 0
K1              0.0738    0.73
K2              0.0847  126.36
x 0 0
x 0 0
M2              1.1077   67.80
x 0 0
M4              0.1641  134.98
M6              0.0870  106.49
M8              0.0226  173.71
N2              0.1794   41.11
x 0 0
O1              0.1135  186.32
x 0 0
P1              0.0364  347.96
Q1              0.0340  136.89
x 0 0
x 0 0
S1              0.0091  314.44
S2              0.2853  124.03
S4              0.0103  287.06
x 0 0
T2              0.0181  114.20
LDA2            0.0394   89.51
MU2             0.0910  187.38
NU2             0.0646   37.27
x 0 0
MK3             0.0171  298.02
2MK3            0.0180  153.72
MN4             0.0610  111.23
MS4             0.1075  191.02
2SM2            0.0282    2.45
x 0 0
MSF             0.0334   29.10
x 0 0
SA              0.0839  214.00
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
2MK6            0.0225  162.35
2MN2            0.0914  269.88
2MN6            0.0474   77.77
2MS6            0.0811  158.75
2NM6            0.0133   57.40
x 0 0
2SM6            0.0142  215.80
x 0 0
3MN8            0.0171  141.48
3MS2            0.0243  303.17
3MS4            0.0192  207.65
3MS8            0.0322  225.31
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
M10             0.0152  190.51
M12             0.0028  200.85
MK4             0.0329  194.94
MKS2            0.0067  253.42
MNS2            0.0211  164.35
x 0 0
x 0 0
x 0 0
x 0 0
MPS2            0.0169  129.30
MSK6            0.0088  225.40
x 0 0
MSN2            0.0212  338.09
MSN6            0.0159  138.51
NLK2            0.0334    6.59
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
SK3             0.0078  350.72
x 0 0
x 0 0
x 0 0
x 0 0
SO3             0.0090  229.46
x 0 0
x 0 0
x 0 0
x 0 0
2ML2S2          0.0154  338.06
SKM2            0.0132    1.69
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
NO3             0.0080  117.32
2MLS4           0.0184  274.59
x 0 0
x 0 0
x 0 0
MNO5            0.0077  144.50
x 0 0
MSK5            0.0036   49.39
3KM5            0.0012  242.74
2MP5            0.0067  258.39
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
2MNO7           0.0061  142.10
x 0 0
2MSO7           0.0067  251.81
x 0 0
2MSN8           0.0132  209.60
2(MS)8          0.0121  292.05
2(MN)8          0.0070  117.28
x 0 0
x 0 0
x 0 0
3MK8            0.0094  227.19
2MSK8           0.0075  295.32
x 0 0
3MNK9           0.0012  289.09
4MK9            0.0013  327.82
3MSK9           0.0021  351.53
4MN10           0.0138  159.07
3MNS10          0.0173  208.38
4MS10           0.0277  233.79
x 0 0
3M2S10          0.0161  288.16
4MSK11          0.0013  156.52
4MNS12          0.0055  205.78
5MS12           0.0064  234.47
x 0 0
4M2S12          0.0052  284.28
M1C             0.0127  120.63
3MKS2           0.0124  305.98
OQ2-HORN        0.0106  348.79
MSK2            0.0144  273.43
MSP2            0.0097   90.89
2MP3            0.0041  151.62
4MS4            0.0050  356.43
2MNS4           0.0093  193.53
2MSK4           0.0075  291.01
3MN4            0.0223  316.24
2MSN4           0.0171   21.24
3MK5            0.0117  181.94
3MO5            0.0087  344.97
3MNS6           0.0126  192.64
4MS6            0.0150  215.14
2MNU6           0.0173   67.96
3MSK6           0.0081  285.94
MKNU6           0.0043  132.92
3MSN6           0.0201    1.13
M7              0.0029  300.41
2MNK8           0.0062  201.47
2(MS)N10        0.0036  283.18
x 0 0
x 0 0
I have only a few ports that I need to add and build into my Harmonics.tcd file.

Any help in explaining and understanding this process would be greatly appreciated.
Any tools suggested to convert would also be very helpful to me.

Thankyou for your time

Terry
Have you e-mailed Dave to see if he has any suggestions? AT the very least, he has the source code to xtide on his site that can show you how the tcds are evaluated.

XTide Downloads

-dan
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Old 07-11-2013, 20:55   #3
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Join Date: Nov 2013
Posts: 10
Re: Harmonic Wizard Needed

Thanks for the reply.
I had already Emailed David as could not find the developer of wxtide's Email address.

As far as I can work out, Wxtide now uses the same data as xtide.
The dev must of updated his harmonics files at some point.

I would love to know how this is done.

Anyone on here understand the data?
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Old 08-11-2013, 04:24   #4
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Re: Harmonic Wizard Needed

I think I understand the data...
The data is mostly a list of harmonic components, amplitude (in units as given in the header, here feet or meters) and phase angle in . The topmost number in the header is the local time difference from UTC, then the shift from hydrographic zero with unit The component names are the classical component names in the field: eg Lambda 2 is written LAMBDA (2) in one set, LDA2 in the other set.
x refers to missing (i.e. irrelevant or unknown) components.

Converting depends on what the program requires:
Translating component names and header.data format and supplying the x's where components are unavailable...

BTW A rather comprehensive european set for opencpn is available here
https://docs.google.com/file/d/0BzWF...bEU/edit?pli=1

Your Brest data is from an old (and well known) data set from the '80s that used to be freely available. It is not very accurate in some cases. Many hydrographic services (UK, France ...) have since then clamped down on free availabily of such data, for financial but also security reasons (Are you competent enough to make use of such data ???)
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Old 08-11-2013, 04:45   #5
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Re: Harmonic Wizard Needed

Greetings and welcome aboard the CF, Terry.
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Old 08-11-2013, 17:18   #6
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Join Date: Nov 2013
Posts: 10
Re: Harmonic Wizard Needed

Quote:
Originally Posted by sailorF54 View Post
I think I understand the data...
The data is mostly a list of harmonic components, amplitude (in units as given in the header, here feet or meters) and phase angle in . The topmost number in the header is the local time difference from UTC, then the shift from hydrographic zero with unit The component names are the classical component names in the field: eg Lambda 2 is written LAMBDA (2) in one set, LDA2 in the other set.
x refers to missing (i.e. irrelevant or unknown) components.

Converting depends on what the program requires:
Translating component names and header.data format and supplying the x's where components are unavailable...

BTW A rather comprehensive european set for opencpn is available here
https://docs.google.com/file/d/0BzWF...bEU/edit?pli=1

Your Brest data is from an old (and well known) data set from the '80s that used to be freely available. It is not very accurate in some cases. Many hydrographic services (UK, France ...) have since then clamped down on free availabily of such data, for financial but also security reasons (Are you competent enough to make use of such data ???)
Thanks for the info.

I wonder if opencpn can export to the data type that is used by both XTIDE and WXTIDE?

I require the tide data for BREST as to work out the tides for other locations using offsets.
The fact that the UK has used public tax payers money to gather the data and then privatised it is a joke!

What would be the best way for me to go about getting the data into WXTIDE or XTIDE?
Surely someone has a UK harmonics tcd file for use with XTIDE??
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Old 08-11-2013, 17:25   #7
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Join Date: Nov 2013
Posts: 10
Re: Harmonic Wizard Needed

The harmonic data within the Harmonics_v8 looks like the following

Code:
BREST, France
01:00 :Europe/Paris
4.09 meters
J1  0.0053   89.00
K1  0.0650   89.00
K2  0.2016  178.00
L2  0.0583  138.00
M1  0.0048   89.00
M2  2.0400  138.00
M3  0.0000    0.00
M4  0.0540  164.00
M6  0.0000    0.00
M8  0.0000    0.00
N2  0.4150  119.00
2N2 0.0546  119.00
O1  0.0670  342.00
OO1 0.0029   89.00
P1  0.0217   89.00
Q1  0.0200  294.00
2Q1 0.0017   89.00
R2  0.0060  178.00
S1  0.0000    0.00
S2  0.7460  178.00
S4  0.0000    0.00
S6  0.0000    0.00
T2  0.0439  178.00
LDA2 0.0143  178.00
MU2 0.0659  119.00
NU2 0.0783  119.00
RHO1 0.0025   89.00
MK3  0.0000    0.00
2MK3 0.0000    0.00
MN4 0.0190  117.00
MS4  0.0340  239.00
2SM2 0.0000    0.00
MF     0.0000    0.00
MSF    0.0000    0.00
MM     0.0000    0.00
SA  0.0470  243.00
SSA  0.0000    0.00
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
x 0 0
2(MS)N10 0 0
#
#
I have come across this file before but still it is different to that used by latest versions of WXTIDE and XTIDE

Any ideas?

Thanks
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Old 08-11-2013, 18:38   #8
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Posts: 10
Re: Harmonic Wizard Needed

I think I have worked it out, Thanks

Code:
Brest, France
+01:00 :Europe/Paris
4.09 meters
J1              0.0053   89.00
K1              0.0650   89.00
K2              0.2016  178.00
L2              0.0583  138.00
M1              0.0048   89.00
M2              2.0400  138.00
M3              0.0000    0.00
M4              0.0540  164.00
M6              0.0000    0.00
M8              0.0000    0.00
N2              0.4150  119.00
2N2             0.0546  119.00
O1              0.0670  342.00
OO1             0.0029   89.00
P1              0.0217   89.00
Q1              0.0200  294.00
2Q1             0.0017   89.00
R2              0.0060  178.00
S1              0.0000    0.00
S2              0.7460  178.00
S4              0.0000    0.00
S6              0.0000    0.00
T2              0.0439  178.00
LDA2            0.0143  178.00
MU2             0.0659  119.00
NU2             0.0783  119.00
RHO1            0.0000    0.00
MK3             0.0000    0.00
2MK3            0.0000    0.00
MN4             0.0190  117.00
MS4             0.0340  239.00
2SM2            0.0000    0.00
MF              0.0000    0.00
MSF             0.0000    0.00
MM              0.0000    0.00
SA              0.0470  243.00
SSA             0.0000    0.00
x 0 0
x 0 0
x 0 0
x 0 0
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Old 08-11-2013, 18:48   #9
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Posts: 10
Re: Harmonic Wizard Needed

Looks pretty good to me

2013-11-09 2:51 AM CET 1.99 meters Low Tide
2013-11-09 7:50 AM CET Sunrise
2013-11-09 8:46 AM CET 6.34 meters High Tide
2013-11-09 1:11 PM CET Moonrise
2013-11-09 3:28 PM CET 1.97 meters Low Tide
2013-11-09 5:02 PM CET Sunset
2013-11-09 9:25 PM CET 5.91 meters High Tide
2013-11-09 11:22 PM CET Moonset
2013-11-10 3:55 AM CET 2.32 meters Low Tide
2013-11-10 6:58 AM CET First Quarter
2013-11-10 7:52 AM CET Sunrise
2013-11-10 9:55 AM CET 6.00 meters High Tide
2013-11-10 1:42 PM CET Moonrise
2013-11-10 4:37 PM CET 2.24 meters Low Tide
2013-11-10 5:01 PM CET Sunset
2013-11-10 10:44 PM CET 5.65 meters High Tide
2013-11-11 12:38 AM CET Moonset
2013-11-11 5:08 AM CET 2.52 meters Low Tide
2013-11-11 7:54 AM CET Sunrise
2013-11-11 11:18 AM CET 5.82 meters High Tide
2013-11-11 2:10 PM CET Moonrise
2013-11-11 4:59 PM CET Sunset
2013-11-11 5:53 PM CET 2.34 meters Low Tide
2013-11-12 12:10 AM CET 5.64 meters High Tide
2013-11-12 1:52 AM CET Moonset
2013-11-12 6:25 AM CET 2.51 meters Low Tide
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Old 08-11-2013, 23:16   #10
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Re: Harmonic Wizard Needed

Woh, well done!

Ehh are you going/willing to updat Harmonic_v8
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Old 09-11-2013, 06:28   #11
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Re: Harmonic Wizard Needed

Quote:
Originally Posted by George64 View Post
Woh, well done!

Ehh are you going/willing to updat Harmonic_v8
I wouldn't know where to start mate.
I've just been taking the harmonic data from V8 and putting it in my XTIDE tcd file.

A lot of the sub stations are an hour out, so haing to manually sort through them
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Old 09-11-2013, 07:20   #12
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Re: Harmonic Wizard Needed

Please delete
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Old 09-11-2013, 07:22   #13
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Re: Harmonic Wizard Needed

Can anyone help me further please.
I have the Harmonic Constants for another port but am very confused how to get them converted into the data that is used in Harmonic_v8

Here is the freely available data

Code:
Port	Date span	Days	Z0	O1	 	K1	 	M2	 	S2	 
 	 	 	 	H	g	H	g	H	g	H	g
Cobh	19061907	 365	 2.255   	 0.034   	 45.80   	 0.021   	 155.50   	 1.381   	 149.60   	 0.433   	 194.20
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Old 09-11-2013, 15:36   #14
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Boat: Jeanneau Sunshine 36
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Re: Harmonic Wizard Needed

It looks like a quizz, but I fear it is done in earnest.
May I strongly advise you to quit inputting data you don't understand, for your own safety (I just cannot imagine you would peddle your results around)

BTW here is the answer to your question.
Using only 4 components when 24 are available and used in the package I have been involved in checking is asking for trouble...

And how can an UK sailor ignore the equation Cobh = Cork ?
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Old 10-11-2013, 07:09   #15
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Re: Harmonic Wizard Needed

Quote:
Originally Posted by sailorF54 View Post
It looks like a quizz, but I fear it is done in earnest.
May I strongly advise you to quit inputting data you don't understand, for your own safety (I just cannot imagine you would peddle your results around)

BTW here is the answer to your question.
Using only 4 components when 24 are available and used in the package I have been involved in checking is asking for trouble...

And how can an UK sailor ignore the equation Cobh = Cork ?
Hi, Thanks for your reply.
I didn't understand the data and thats what brings me here, to try and understand how it all works and get some expert advice.
I find it all very interesting and has become a personal hobby.
I didn't come here for a geography lesson on Ireland either
Some of the locations I am interested in use Cobh or (Cork) as a reference station. Namely,
Portland
Bridgport
Lyme Regis
Exmouth
Teignmouth
Torquay
Dartmouth
Salcombe
Devonport
EastLooe
Fowey
Falmouth Penzance

I am NOT a Sailor, I am more interested in Low tide than High tide and WILL NOT use the data for navigational purposes.
I am only interested in the UK and Ireland.

Cheers
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