Abstract: Disclosed herein are a device and method designed for determining the liquid level in a container through measuring the pressure in the liquid by a pressure sensor located at the bottom of the container within a chamber designed to prevent solid particles dispersed in the liquid from reaching the sensor. Measuring the pressure of the liquid in the container can be based on an upper chamber located above a lower chamber, both adjacent chambers are located within a container. The upper chamber comprises tiny slots allowing the liquid in the container to enter the upper chamber and exert a weight on a diaphragm gasket functioning as a common-wall of the two adjacent chambers. The diaphragm gasket exerts pressure resulting from the liquid weight, on the lower chamber containing the pressure sensor designed to measure the pressure exerted on the lower chamber.

Abstract: The invention concerns a vehicle tracking network including a plurality of subscriber vehicles and a control-center; and systems and methods for tracking vehicles, which are subscribers to such vehicle tracking network. In certain implementations, the method for tracking a subscriber vehicle includes the following operations carried out at the subscriber vehicle: monitoring operation of one or more services related to at least one of a wireless network communication service and positioning service associated with the subscriber vehicle; upon detecting a failure in at least one of said services, generating a corresponding distress signal encoded to be identifiable by other subscriber vehicle(s) of the vehicle tracking network; and broadcasting the encoded distress signal such that it is detectable by one or more of the other subscriber vehicles of the vehicle tracking network, which are located in the vicinity of the subscriber vehicle broadcasting the distress signal.