21 km/h in the rivers frame of reference.
Add the rivers velocity to the boats velocity
If the motorboat was hindered in its ability to maneuver, such as a tug pulling a boat or pushing a barge, or if the motorboat was adrift or signaling distress. Understanding the rules of underway and give-way are important parts of maritime safety.
The sailboat is the give-way vessel when it is overtaken by the motorboat, which is generally considered the stand-on vessel. Additionally, when both vessels are on a collision course and the motorboat is to the right (starboard) of the sailboat, the sailboat must give way. In situations where both boats are under sail, the sailboat must also give way to a motorboat if the motorboat is not under command.
sail boat has the right of way and same applies to all other boats larger than yours
fish and water and sometimes boats
When a motorboat approaches a sailboat head-on, both vessels have a responsibility to avoid a collision. According to the rules of the road at sea, the power-driven motorboat must give way to the sailing vessel, as it is the stand-on vessel in this situation. The sailboat can also take action to maneuver safely, ensuring both boats can pass without incident. Communication between the vessels may also help clarify intentions and enhance safety.
Generally, smaller motorboats are easier to maneuver in tight spaces and shallow waters, as they can navigate with greater agility. In calm conditions, almost any motorboat can be handled easily, but in rough waters, larger boats with more powerful engines offer better stability and control. Additionally, boats with features like bow thrusters are more manageable in challenging docking situations. Ultimately, the ease of maneuvering also depends on the operator's experience and familiarity with the specific vessel.
70.7 nautical mi.
through long travels and lots of old boats
That would be a hovercraft. However, hovercraft are not really boats and can travel on both land and water.
Victor Slocus has written: 'Castaway boats' -- subject(s): Voyages and travels, Castaways, Seafaring life, Adventure and adventurers
Boats, ships, and aquatic life such as fish and marine mammals travel on water. Additionally, surfers and swimmers can also be seen traveling on water.