170' - it sounds great - have it wrapped and sent round...
JimL - if DGPS will still require an improved radar to more accurately determine the obstacle environment then why not just improve the radar and get reduced minimas that way? Do the N Sea operators really need to improve their bad weather capability or will the number of times a DGPS approach gets used in anger justify the cost? If the CAA is willing to look at GPS approaches to rigs then why not to airports -those plates shown earlier seem to be standalone and not requiring additional navaids.