In this task, you are given a sentence or phrase in English. You must translate it to Xhosa in a way that is equivalent in terms of meaning and grammatically correct.

This taught the sailor how many degrees must be added to, or subtracted from, his observed altitude in accordance with the positions of the Guards.
Le yafundisa abathengisi ukuba zingaphi izidonga ezunokongezwa, okanye zithatyathwe kujongo lomphakomo ngokwendawo eyiugadileyo.

However, a permanent repair is essentially a task for a shipwright.
Ulungiso oluzinzileyo kuyimfuneko ukuba ibe ngumsebenzi womkhandi wenqanawa.

Wear and damage to the grooves must be checked.

Ugugo kwakunye nomonakalo kumgca okroliweyo kufuneka ujongwe.