Whenever we do a mission on a planetary surface, our Discovery Scanner reveals a "Search Zone" on the planet-a single, hollow circle that keeps moving about every time you get near to it.....until it becomes fixed. Though a massive improvement on the pre-2.1 mechanics, I really think its time to overhaul the system.
Retain the hollow circle, but instead make it the center of a proper Search Zone-a roughly square, rectangular or circular area of a certain size on the surface of a planet (with the zone's extent marked out-in colour on the planet in the System map). The better the quality of the scan used to detect the mission target, the smaller the search zone would be, & the object of your mission-within that zone-becomes a fixed, persistent point on that planet for the whole time the commander is in that system. It is then up to each commander, based on the circumstances, to determine how they want to pinpoint their mission target-by eye, from their ship; using the blue circle within the search zone, or using the Wave Scanner in their SRV. Note, though, that a search zone can contain other PoI's outside of the Mission Target-making the "by eye" approach not always 100% accurate.
On a final note, this same "Search Zone" mechanic could be used, with a slight modification, for non-mission based exploration of planets. Use of a Discovery scanner would highlight zones on the planet's surface, of varying size, with an indication of how many PoI's lie within that zone.....& possibly even what type of PoI's if a truly detailed scan is performed.
Retain the hollow circle, but instead make it the center of a proper Search Zone-a roughly square, rectangular or circular area of a certain size on the surface of a planet (with the zone's extent marked out-in colour on the planet in the System map). The better the quality of the scan used to detect the mission target, the smaller the search zone would be, & the object of your mission-within that zone-becomes a fixed, persistent point on that planet for the whole time the commander is in that system. It is then up to each commander, based on the circumstances, to determine how they want to pinpoint their mission target-by eye, from their ship; using the blue circle within the search zone, or using the Wave Scanner in their SRV. Note, though, that a search zone can contain other PoI's outside of the Mission Target-making the "by eye" approach not always 100% accurate.
On a final note, this same "Search Zone" mechanic could be used, with a slight modification, for non-mission based exploration of planets. Use of a Discovery scanner would highlight zones on the planet's surface, of varying size, with an indication of how many PoI's lie within that zone.....& possibly even what type of PoI's if a truly detailed scan is performed.