


ANM 9 / 06/ 03 


From: IALA AISM [iala-aism@wanadoo.fr]
Sent: 06 February 2007 12:50
To: Torsten Kruuse; Mahesh Alimchandani; secgen.iala@wanadoo.fr
Subject: Fw: Standards for Marine Highways - To the attention of Dr Torsten Kruuse


----- Original Message ----- 
From: Jean Laporte 
To: iala-aism@wanadoo.fr 
Cc: IHO CDR Shipman ; IALA Sec Gen ; IHO Michel HUET ; SOUTH AFRICA Neil Guy ; SOUTH AFRICA HO Abri Kampfer ; US University ; Henri Dolou ; LE CORRE Francois 
Sent: Tuesday, February 06, 2007 1:13 PM
Subject: Standards for Marine Highways - To the attention of Dr Torsten Kruuse


Dear Doctor Kruuse,

In addition to our recent telephone conversation, I would like to suggest that the issue of Marine Highways standards be tabled at the next IALA E-Nav committee meeting, due to take place in Southampton from the 19 till the 23rd of March.

As explained, SHOM is presently making assessments of the surveys that have to be performed to connect Madagascar’s main ports to the GEF-Western Indian Ocean Marine Highway Development and Coastal and Marine Contamination Prevention Project developed by the Governments of South Africa and neighbouring countries (Comoros, Kenya, Madagascar, Mauritius, Mozambique, Seychelles and Tanzania). 

To figure out the cost of our ship’s deployment, we need to calculate the length and number of swathes to be performed. According to SHOM’s current policy, these have to be at least equal to, or in excess of, international standards. Unfortunately there are no standards to our knowledge, which is not surprising for such new schemes. 

I have also established contact with Dr Lee Alexander who is a well known authority in our field.

Dr Alexander expressed the view that, 

  a.. considering the need for mariners to keep enough space for anti-collision, a sensible width would be comprised between 5 and 10 miles, i.e. two MBES swaths in the ocean deep waters. 
  b.. In traffic separation schemes or when ships use dead reckoning instead of GPS (failure or lack of satellite equipement), the width should be doubled, i.e. be comprised between 10 and 20 miles. 
These figures, completed by your remarks on narrow passages such as the Storebælt or the Bosporus, could provide a starting point for further discussion aimed at defining a set of internationally accepted ad-hoc rules. 

I shall also try to broach this issue at the next North Indian Ocean Hydrographic Commission (NIOHC) which convenes on February 27th and keep IALA informed of the outcome.

Thanking you for your help,
                                                                                                                                                                                                                                   Yours sincerely

Jean Laporte


-- 
Jean Laporte
Ingénieur général de l’armement (2S)
Chargé de mission international / Senior International Consultant
Service hydrographique et océanographique de la marine (SHOM)
01 53 66 97 84 (direct) - (01 53 66 97 76 - 01 53 66 97 77)
<jlaporte@shom.fr> - <jean.laporte2@marine.defense.gouv.fr>




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