1. What I refer to as a "snail trail". I don't know about other devices but my Garmin 64S does. Extremely useful for me.
2. Not that I'm aware of. Will cetainly give a straight line from position to any spot you choose, sight and go. Not recommended to follow though, guaranteed grief for user.
3. Probably, but I'm not that clever. I'm old skool, I use an enlarged topo 50, laminated, for where ever I'm going and use in conjunction with GPS. It works for me. That practise also allows me to use a compass should my GPS shit itself. It hasn't yet, but I'm a conservative, better safe than sorry type of bloke
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