Hello In my menu 5-4 of the mark v field I have the following choice....8.2 455 and 8.2-455 in the book..BUt on the radio I have 8.2 455 8.2-455 and also 500H...I do not see this last one(500h) in the book..... Anybody can tell me what is it????the last 500H Thanks NOEL