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On a VFR flight there is no minimum safe altitude.
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Yes, this was partially my point...but anyways, forget about the RADDY thing, here's all I'm saying:
1) The best feature of a VFR flight plan is that it will initiate the location/SAR process if you are overdue, at a specified time. The VFR flight plan will function whether or not you are talking to ATC, whether or not ATC refuses or terminates your flight following, whether or not there is ATC radar or radio coverage, regardless of the type of terrain beneath you, regardless of your altitude, etc. That is useful in certain situations.
2) You can often be VFR over mountainous terrain at a SAFE altitude for your flight operation, but still too low for flight following service. Sure, you can cruise at radar-friendly altitudes and get FF service, but there may be times when you want to be lower. Examples: scenic sightseeing and photo flying, survey/patrol flying, SAR flying, flying a plane without good high-altitude performance, and operating in and out of backcountry airstrips that are tucked down in valleys.
Gotta stop talking about mountains - I'm starting to miss home!