The answers for your questions are limitless. But I'll try to give short ones. A decient cast out the back is good enough. Longlining speed is generally around 1 mph. Spider rigging is moving VERY slowly, generally too slow for GPS to pick up much. I spider rig and long line both but not at the same time. You can do either at any time of the year. I favor long lining as it can be done successfully in just about any wind speed. For me, spider rigging is tough if the wind is above 8 mph.