Code numbers

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I purchased a 2003 Odyssey last week which has Navigation installed. I cannot use it because the code numbers were not passed on to me. I am told that I have to go to a dealer to get it reprogrammed. I am a 66 year old lady paralysed from the waist down and cannot afford what a dealer will charge me for this. I do have a freind who will do the work if someone can explain to me how to do it.