<prompt> Translate the following text to EnglishIkiwa una nia ya kwenda kwenye vilima, unapaswa kuchukua ramani sahihi ya Ordnance Survey pamoja na wao hutoa miongozo ya kina zaidi ya eneo hilo.  <response>: If you intend to head out onto the fells, though, you should take the appropriate Ordnance Survey map along they provide the most detailed guides to the terrain. 