A method for signaling an impending lack of operability of a position determination device (PV) equipped with a GNSS receiver (GE), wherein the method comprises following method steps: - determining a first receive signal strength of a GNSS signal received by the GNSS receiver (GE), - determining at least one second receive signal strength of the GNSS signal received by the GNSS receiver (GE), - evaluating the first receive signal strength and at least the second receive signal strength and generating a result of the evaluation, - determining a position of the position determination device (PV) by means of the GNSS signal received from the GNSS receiver (GE), - comparing the determined position with a set of weak reception areas stored in a memory, where interferences and/or an absence of GNSS reception are known, and - deciding on the triggering of a signaling depending on the result of the evaluation and the position comparison, wherein the first receive signal strength of the GNSS signal received by the GNSS receiver (GE) is determined at a first reception time or averaged over a plurality of first reception times or over a first reception time range, and wherein the second receive signal strength of the GNSS signal received by the GNSS receiver (GE) is determined at a second reception time or averaged over a plurality of second reception times or over a second reception time range, wherein the evaluation of the first receive signal strength and the second receive signal strength comprises a comparison of the first receive signal strength with the second receive signal strength, wherein the triggering of the signaling takes place when the second receive signal strength deviates from the first receive signal strength by a predetermined deviation threshold value and the determined position does not correlate with a weak reception area. - determining a first receive signal strength of a GNSS signal received by the GNSS receiver (GE), - determining at least one second receive signal strength of the GNSS signal received by the GNSS receiver (GE), - evaluating the first receive signal strength and at least the second receive signal strength and generating a result of the evaluation, - determining a position of the position determination device (PV) by means of the GNSS signal received from the GNSS receiver (GE), - comparing the determined position with a set of weak reception areas stored in a memory, where interferences and/or an absence of GNSS reception are known, and - deciding on the triggering of a signaling depending on the result of the evaluation and the position comparison, wherein the first receive signal strength of the GNSS signal received by the GNSS receiver (GE) is determined at a first reception time or averaged over a plurality of first reception times or over a first reception time range, and wherein the second receive signal strength of the GNSS signal received by the GNSS receiver (GE) is determined at a second reception time or averaged over a plurality of second reception times or over a second reception time range, wherein the evaluation of the first receive signal strength and the second receive signal strength comprises a comparison of the first receive signal strength with the second receive signal strength, wherein the triggering of the signaling takes place when the second receive signal strength deviates from the first receive signal strength by a predetermined deviation threshold value and the determined position does not correlate with a weak reception area. <EOS>