Sailing Instructions

The Revised 2021 Notice of Race is published (provisional - announcement to follow shortly)

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The high Points scoring explained:

(This article was updated 10th September 2018)

ISORA High Points Scoring Stystem and Race Weighting:

The high points system of scoring allows the use of multipliers (weighting) to adjust, upward or downward, from the standard 100 points for a win. So a win in a 1.3 weighted race (hardest/most challenging) would be 130 points and 90 points for a Coastal Race etc.

We have also applied another adjustment by way of a formula called ‘CHIPS3’ to provide more reward in a larger fleet and less in a smaller fleet.
This is all explained in the document below.

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For 2018 the weighting was agreed in the AGM as follows:

'Series scored using the High Scoring System, the more difficult races are weighted with a factor of 1.3 for cross channel Races over 100 miles (and Race 15). 1.2 for cross channel races less than 100 miles. 1.0 for the Night Race and 0.9 for day races.
A win in a large fleet will score better than a win in a small fleet using the CHIPS 3 formula.'

Class / Overall Differential:

The difference points between Overall and Class points is because each Class Race is treated as a totally separate and standalone Race i.e. they are not scored for their placing overall but for their placing in class.

So – if we look at 3 boats in Race 1 in Class 0 and they are A = 1st ,. B= 2nd and C =3rd (in that Class) so all will receive high point in their class

Overall boat A is 1st but B is 15th and C 20th – A will have high point overall but B and C will have much lower points in the overall results

Next Race

B = 1st , C= 2nd and D =3rd   in Class

But overall B is 11th C is 12th and A is 13th

So after 2 races all boats in Class will be very closely scored but overall A will have a lot more points because of her win in a much larger overall fleet.

Then apply the above to 15 races and then throw in the discards ¬– you can see how the Class and Overall can look different.

ISORA did actually question this but concluded that the score in Class is important as a standalone and should not be watered down by using the overall points.


 

At the 2016 ISORA AGM it was agreed that competitors should be from ISAF Categories Groups 1. Boats with ISAF Group 3 crew would be entered into a separate overall series, would not qualify for the Corinthian race win or series win.

This restriction was amended for 2017 season and removed for the 2018 Season

The ISAF definitions for Group 1 sailors is below. 

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HRAlogoSaturday 11th September 2021  - Weighted 1.2

This race is the last race in the MUSTO ISORA 2021 Offshore Series.

The Race Supplemental Sailing Instructions (SSIs) is published below

 The course will be announced on Thursday before the race.

 

START (As Defined in SSIs)

PSC 1 (P)

ISORA VM (S) (As Defined in SSIs)

FINISH LINE at Dun Laoghaire (As Defined in SSIs)

 

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We recommend that anyone interested in this race should subscribe to the ISORA (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


 

MustoSunday 29th August 2021 

Pwllheli  Coastal RaceRace

This race is Race No. 14 in the Musto ISORA 2021 series and the 4th and last race in the ISORA “Plas Heli Coastal Series” . So many races within the same race!

AMENDMENT 1.

Start Time for Race 14 CW

The start on Sunday 29th August is 1100hrs

AMENDMENT 2.

The Course  Saturday 28th August is as follows:

Start (PSC Bridge as defined in the SIs)
PSC 1(P)
Tom Buoy (S)
PSC 3(S)
Pwllheli Fairway (S)
Tom Buoy (P)
PSC 10 (P)
Finish (Plas Heli line as defined in the SIs)

AMENDMENT 3.

Shorten Course for Race 13 CW

At 1600hrs BST all yachts that have not finished must  record their GPS position at that time and supply it to the Race Committee.

This will be used to calculate the distance made good along the rhumb-line. Should a yacht not be exactly on the rhumb-line at 1600, the rhumb-line distance will be established by taking a line from the yacht’s position to the rhumb-line and at right angles to the rhumb-line.

The yacht’s distance made good along the rhumb-line will be divided by the elapsed time of the race to give the Actual Average Speed.

For a yacht not finishing by 1600 hrs, the rhumb-line distance from the start to the finish will be divided by the yacht's elapsed time for the entire course to give the Actual Average Speed.

The Actual Average Speed, however derived, will be divided by the yacht’s IRC number to give the Corrected Average Speed.

 


The Supplemental Instructions is now published - see below:

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The Course will be published here:

Start (PSC Bridge as defined in the SIs)
to be confirmed
Finish (Plas Heli line as defined in the SIs)

 

The course will be announced on Thursday before the race. 


We recommend that anyone interested in this race should subscribe to the ISORA and CHPSC newsletters (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please reply to This email address is being protected from spambots. You need JavaScript enabled to view it.


 

MustoRace 12  CI - 28th August 2021 

This race is Race No. 12 in the Musto ISORA 2021 series and the 3rd race of the ISORA “Viking Marine Coastal Series” So many races within the same race!

The Supplemental Instructions is now published, below:

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VikingMarine300x150

 We recommend that anyone interested in this race should subscribe to the ISORA e-newsletters (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please reply to This email address is being protected from spambots. You need JavaScript enabled to view it.

ISORADublinMarkWP


 

MustoSaturday  28th August 2021 

Pwllheli  Coastal RaceRace

This race is Race No. 13 in the Musto ISORA 2021 series and the 3rd race in the ISORA “Plas Heli Coastal Series” . So many races within the same race!13 PlasHeli

AMENDMENT 1.

Start Time for Race 13 CW

The start on Saturday 28th August is 1000hrs

AMENDMENT 2.

The Course  Saturday 28th August is as follows:

Start (PSC Bridge as defined in the SIs)
PSC 10 (S)
Tom Buoy (S)
Pwllheli Fairway (P)
PSC 3 (P)
Tom Buoy (P)
Finish (Plas Heli line as defined in the SIs)

AMENDMENT 3.

Shorten Course for Race 13 CW

At 1500hrs BST all yachts that have not finished must  record their GPS position at that time and supply it to the Race Committee.

This will be used to calculate the distance made good along the rhumb-line. Should a yacht not be exactly on the rhumb-line at 1500, the rhumb-line distance will be established by taking a line from the yacht’s position to the rhumb-line and at right angles to the rhumb-line.

The yacht’s distance made good along the rhumb-line will be divided by the elapsed time of the race to give the Actual Average Speed.

For a yacht not finishing by 15000 hrs, the rhumb-line distance from the start to the finish will be divided by the yacht's elapsed time for the entire course to give the Actual Average Speed.

The Actual Average Speed, however derived, will be divided by the yacht’s IRC number to give the Corrected Average Speed.

 

The Supplemental Instructions is now published - see below:

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The Course will be published here:

Start (PSC Bridge as defined in the SIs)
to be confirmed
Finish (Plas Heli line as defined in the SIs)

 

The course will be announced on Thursday before the race. 


We recommend that anyone interested in this race should subscribe to the ISORA and CHPSC newsletters (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please reply to This email address is being protected from spambots. You need JavaScript enabled to view it.


 

HRAlogoSaturday 31st July 2021  - First Cross Channel Race 

This race is the 11th race in the MUSTO ISORA 2021 Offshore Series.

The Race Supplemental Sailing Instructions (SSIs) is now published here

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The course has been announced.

START (As Defined in SSIs)
ISORA Dublin Bay Virtual Mark (port)
FINISH LINE at  Pwllheli (As Defined in SSIs)


We recommend that anyone interested in this race should subscribe to the ISORA (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


 

MUSTO ISORA has one race scheduled for this week :

Race Number  Descriptioniption

 Race 11 OIW (Musto Offshore Race) 

 Start Saturday Morning 31st July

  ISORA MUSTO Offshore Race - Dun Laoghaire to Pwllheli
  75 miles + Weighting 1.20.9, VHF 17, Cat 3 +LifeRaft

 

  VikingMarine300x150
Follow this link for the SSIs

 

Please read the SSIs, Notice of Race and General Sailing Instructions and the Back to Boating Protocol

Complete the on line entry form, ISORA Crew Manager App and text to confirm that you are racing 

The responsibility for a boat’s decision to participate in a race or to continue racing is hers alone. (RRS Fundamental Rule 3)


 

MustoRace 10 CI - 10th July 2021 

This race is Race No. 10 in the Musto ISORA 2021 series and the 2nd race of the ISORA “Viking Marine Coastal Series” So many races within the same race!

The Supplemental Sailing Instructions is now published below :

 

VikingMarine300x150

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 We recommend that anyone interested in this race should subscribe to the ISORA e-newsletters (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please reply to This email address is being protected from spambots. You need JavaScript enabled to view it.

ISORADublinMarkWP


 

HRAlogoFriday 2nd July 2021  

This race is the 9th race in the MUSTO ISORA 2021 Series.

The Race Sailing Instructions (SIs) is now published see below

 

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The course will be announced on Thursday before the race.

 

START (As Defined in SSIs)

FINISH LINE at Dun Laoghaire (As Defined in SSIs)

 Lyver Trophy Race - 2021

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We recommend that anyone interested in this race should subscribe to the ISORA (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


 

MustoRace  8 OI - 2nd July 2021 

This race is Race No. 8 in the Musto ISORA 2021 series 

The course will be published here shortly:


The Supplemental Instructions is published below:

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 We recommend that anyone interested in this race should subscribe to the ISORA e-newsletters (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please reply to This email address is being protected from spambots. You need JavaScript enabled to view it.

ISORADublinMarkWP


 

HRAlogoSaturday 212th June 2021  

This race is also the second Offshore race in the MUSTO UK ISORA 2021 Offshore Series.

The Race Supplemental Sailing Instructions (SSIs) is published below


Amendment to SSIs for Race No. 7 Offshore Wales (OW) 

1. PSC1 substituted  for PSC2

2. In the event of the course being shortened - pass Archdeacon as per mark of the course - the finish line is an undefined length north of the Buoy, not 0.3m as previously published.

3. Course shortening will be announced. by the lead  boat on CH17, and subject to phone signal posted  on the ISORA UK 2021 WhatsApp group

 see the SSIs here


 


The course is published as follows: 

START (As Defined in SSIs)

PSC2 (P) PSC1 (P)(amendment No. 1)

The Skerries (S)

Ethel Rock Cardinal (S)

Archdeacon Cardinal (S)

Finish: Line running 0.3nm south of Q1.

Shortening in the event of a slow race to allow boats to get to the Sunday lunchtime lock in Liverpool.  

If the first boat doesn’t cross a line running north from Ethel Rock Cardinal by 00:00 Sunday then the finish will be moved to a line running 0.3nm North of Archdeacon Cardinal.

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We recommend that anyone interested in this race should subscribe to the ISORA (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


 

HRAlogoWednesday 9th June 2021  

This also the second race in the Irish MUSTO ISORA 2021 Offshore Series.

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The Race Supplemental Sailing Instructions (SSIs) is now published below:

 

 

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See the competitor list and results here


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We recommend that anyone interested in this race should subscribe to the ISORA (priority racing) so that you will receive the latest racing information.

If you need help with anything whatsoever please contact This email address is being protected from spambots. You need JavaScript enabled to view it.


 

MUSTO ISORA has two races scheduled for this week :

Race Number  Link to SSIs Description

 Race 06 OI (offshore Ireland) D2D

 Start Wednesday 9th June 

 SSIs here   Offshore Race - Dun Laoghaire to Dingle
  270 miles + Weighting 1.2, VHF multiple, Cat 3 +Liferaft

 Race 07 OW (Offshore Wales 

 Start on Saturday 12th June 

 SSIs here   Offshore Race - Pwllheli to Liverpool Bay
 110 miles + Weighting 1.2, VHF 17, Cat 3 +Liferaft

Please read the SSIs, Notice of Race and General Sailing Instructions and the Back to Boating Protocol

Complete the on line entry form, ISORA Crew Manager App and text to confirm that you are racing by Wednesday 26th May

The responsibility for a boat’s decision to participate in a race or to continue racing is hers alone. (RRS Fundamental Rule 3)


 

MUSTO ISORA has two races scheduled for this week :

Race Number  Link to SSIs Description

 Race 08 OI (offshore Ireland) 

 Start Saturday Morning 3rd July
[NOTE: Chnged from Friday]

 SSIs here   Offshore Race - Dun Laoghaire to Dun Laoghaire
  70 miles + Weighting 1.2, VHF multiple, Cat 3 +Liferaft

 Race 09 OW (Offshore Wales 

 Start on Friday Evening 2nd July 

 SSIs here   Offshore Race - Lyver Trophy Race Liverpool to Pwllheli 
 110 miles + Weighting 1.3, VHF 17, Cat 3 +Liferaft

Please read the SSIs, Notice of Race and General Sailing Instructions and the Back to Boating Protocol

Complete the on line entry form, ISORA Crew Manager App and text to confirm that you are racing by Wednesday 30th June

The responsibility for a boat’s decision to participate in a race or to continue racing is hers alone. (RRS Fundamental Rule 3)


 

Subcategories

 MustoThe ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.


 

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.

 The ISORA sailing instructions will be avialable here for each race - when published. Important race information will be distributed by newsletter - so please remember to subscribe to the newsletter service.RealBoats2015Series3

The 2022 Race Schedule will be published here shortly ..... 

 


 

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