In the USA (which uses TERPS) and, just for the sake of argument, one is operating a private aircraft (a business jet, or turbopropellor type, for example) the
lack of a published departure obstacle clearance procedure from an airport which has a published instrument approach...
IF one maintains a climb rate of at least 200 feet/mile, and no turns are attempted below 400 feet (agl), terrain/obstacle clearance is assured.
Radar or no radar.
And yes, the FAA does indeed survey these things...
