I agree with you ironraven about ultralighters not having a back-up plan.
I have never dealt with ultralight hikers (we just do not have the trails here) but I have a lot of exposure with wilderness canoe groups including youth groups. These are usually terrific people with lots of experience, but what I find they are missing is a means to contact the outside world if something goes wrong (eg smashed canoe) or if someone gets seriously sick or injured.
Most file good trip plans but do not carry a satellite phone, PLB, or even basic signal tools such as a mirror or flares. They also do not usually carry any simple incoming communication devices like an FM or weather radio so they are unaware of impending storms or fire dangers/restrictions.
In todays world of available high-tech communication I would not allow my child to venture off on a wilderness trip without the group having some form of outgoing emergency communication.
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