Before revision: 495x495px|Obtaining the height line Marcq St. Hilaire The navigational algorithms are the quintessence of the executable software on portable calculators or PDA as an aid to the art of navigation, this attempt article describe both algorithms and software for " PC-PDA " implementing different calculation procedures for navigation .
After revision: 495x495px|Obtaining the height line Marcq St. Hilaire The navigational algorithms are the quintessence of the executable software on portable calculators or Smartphone as an aid to the art of navigation, this attempt article describe both algorithms and software for " PC-Smartphone " implementing different calculation procedures for navigation .