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Ask five people on the same ferry what they want from a map of the island ahead, and you'll get five different answers. The walker wants contour lines and the footpath that avoids the scree. The sailor wants depths, a compass rose and the shape of the harbour wall. Someone in a hire car wants to know which of the two roads marked on the leaflet actually reaches the beach car park. All five are right. They are simply holding four different kinds of document, and only one of them will answer the question being asked.
Most map mistakes on islands come from choosing by scale alone. A 1:50,000 sheet sounds precise, so people buy it for a driving day and then discover the junctions are simplified to the point of guesswork. Meanwhile a cheerful, hand-drawn tourist map with a wobbly coastline can be the best possible tool for a first afternoon on foot, because it puts the ferry terminal, the old town and the beach in a relationship you can hold in your head.
So the useful question is not "which map is most accurate?" but "which map is accurate about the thing I'm doing?" Style tells you what the cartographer cared about. On an island, where the coast squeezes everything into a narrow band, that choice matters more than it does on the mainland. Terrain changes fast, roads turn into tracks, and a headland that looks close on paper can be an hour's detour around an inlet.
Tourist maps are designed for the first day, and they are good at it. They exaggerate landmarks, label beaches and viewpoints, mark bus stops and ferry landings, and often include the things a small island genuinely needs to tell a stranger: where to hire a scooter, where the market is on a Tuesday, which beach has a lifeguard.
Their weaknesses are worth naming. Distances are usually approximate, sometimes wildly so; a promontory drawn as a twenty-minute stroll can take forty along a road with no pavement. Scale is often missing or decorative. And in some printed versions, the businesses plotted on the map have paid for the privilege, which doesn't make them wrong, but does mean the map is a partial view of the island's commerce as well as its geography.
Use them the way they're built to be used: stand at the notice board in the port, photograph the "you are here" panel, mark your accommodation, and get your bearings before you decide anything. Then check any distance that matters against a second source.
For hiking, nothing replaces a proper topographic sheet. Contour lines show how steep the ground really is and where the ridge flattens out. Footpaths, dry-stone walls, springs, ruined farmhouses and vegetation symbols fill in the detail that determines whether a route is a pleasant three hours or a scramble through thorn scrub.
Two numbers do most of the work. The scale tells you how much ground is squeezed onto the paper — 1:25,000 is the standard for walking, 1:50,000 for longer traverses where you mainly need the shape of the terrain. The contour interval tells you how much height each line represents; a 20-metre interval hides small knolls, a 10-metre interval shows them. Check the survey date too. An old edition may show a track that has since become a firebreak, or a spring that has dried.
A nautical chart is not a map of the island with water added. It is a document about the sea, and the land is mostly there as a boundary. Depths are given as soundings in metres or metres and fathoms depending on the edition, and they are measured against chart datum, so the number printed is a low-water figure. Symbols mark buoys, lights, sectors, anchorage limits, cables, rocks that dry at low tide, and harbour walls with their exact orientation.
This is where visitors most often go wrong: a chart from an old survey may show a sandbank where one used to be. Channels shift after storms, and harbour layouts change. Charts are corrected through notices to mariners, and an uncorrected chart is a historical document rather than a sailing tool. If you're skippering your own boat in unfamiliar water, take local advice, check the current edition, and treat any chart as one input among several. If you're hiring a boat with a skipper, the local knowledge on board usually outweighs anything you can read on deck.
For non-sailors, charts are still worth a look. They explain why the ferry takes an odd dogleg around a headland, and they show which coves have a usable landing.
Road maps at 1:200,000 or so are built for exactly one job: getting you from the port to the village on the far side without a wrong turn at a fork. They classify roads by width and surface, show junctions clearly, mark tolls and service areas, and give a sense of which routes are scenic rather than merely direct. On islands, they also reveal the shape of the coast road — the difference between a fast run along the shore and a series of switchbacks over an inland ridge.
Keep one in the car even if you're navigating by phone. Coverage drops in the hills, roaming charges surprise people, and a screen shows you the next two kilometres while a paper sheet shows you the whole island and the fact that the road you're on loops back to where you started. Mark the trailhead, the last fuel stop and the ferry time on it in pencil.
The practical answer, most of the time, is to carry more than one. A sensible pairing for a mixed week:
Three paper items and two habits will cover most trips. Take one road map at island scale, one topographic sheet for wherever you plan to walk, and one tourist map for orientation, folded into a zip bag with a pencil. Add a small compass if you'll be on foot above the treeline or in cloud. Before you leave, photograph the legend of each map — the symbols are the part people forget, and a legend picture on your phone solves most arguments on a windy ridge.
The habit that matters most is checking the date and the source. A map printed for visitors and a map surveyed for walkers are both honest about different things, and neither pretends to do the other's job. Read the margin, look at who made it and when, and match it to what you're actually doing that day. On an island, where a headland can reset your whole plan, that small piece of attention is worth more than any extra scale.
Photo: Joa70 / Pixabay
