All good ships have a spyglass so they can see other ship flags, hazards in the water far enough out, and to look for coast line. But sometimes a simple spyglass isn't enough. A Spyglass of Power allows several other abilities besides the obvious.
1) The Spyglass of Power allows a person to see twice the distance of a normal spyglass. Ship captains love this because they have more options for turning their ships to a safe path.
2) The Spyglass of Power allows a person to see magical auras through the spyglass. This can be used up close or far away and allows a ship captain (especially of a pirate ship) to see if an attacking ship has any magic upon it, or if any of the crew is carrying magic.
3) Lastly, the Spyglass of Power can hear at a far off distance. So if a person wants to hear what someone is saying in a rowboat coming their way, or even hear what someone is saying on the docks or shore they can.