Planimeter - Area and fields measure using GPS. The best and useful app for an area, distance and perimeter measure by GPS. This tool help you measure fields, mark their needed points and sharing their measured maps. GPS area measure is also useful as a map measurement tool, with very high accuracy for building and farm contractors and farmers. Planimeter is probably the best app to field area measure and land surveying. You can also measure distance, perimeter, bearing, angle and GPS coordin