On a conventional dating app, two people may appear close because the map measures a straight line. The map does not wait at Toft, check the Yell Sound timetable or account for a cancelled sailing. That matters.
A Lerwick and Scalloway match is one thing. Lerwick and Brae may still be practical with a bit of planning. Meeting between Mainland and Unst, Yell, Whalsay or Foula is a different proposition, particularly for anyone working shifts, caring for family or relying on public transport.
A useful match is not simply nearby on screen. It is someone you can reasonably meet without turning every date into a transport operation.Be clear about your area from the start. You do not need to publish your address or even name a tiny settlement if that feels too revealing. South Mainland, Lerwick area, West Mainland, North Mainland or the relevant island is usually enough to establish whether a meeting is realistic.
It also helps to say what travel you can manage. Perhaps you regularly come into Lerwick for work. Perhaps you are happy to travel across Mainland but cannot depend on evening ferries. Neither is a lack of effort. It is useful information, and it prevents a promising conversation from running into an obvious practical problem later.