Originally Posted by
wrench1
To add, the majority of the helicopter IFR GPS approach procedures to US hospital helipads are proprietary to the operator or hospital. Last I recall there were over 275 private approach procedures in use in the US. Here's a
link to a company that has developed a number of them for their clients.
The ones being introduced in the UK will be similar. Each operator will have a bespoke database which is the standard one plus the PINS. In the cockpit the approach is nearly identical to a a standard instrument approach except that the RNP is set at 0.3 for the whole initial, approach and missed approach segments (which helps to get the whole approach lower)