Downloading maps for Offline Use
Some of the maps are downloaded in full the first time you select them. Larger maps automatically download data on-the-fly as you scroll around the map. But if you are planning a trip outside an area of internet connectivity (or if mobile internet data is expensive), you can download the detailed coverage you need in advance. There are a number of ways you can do this:
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Download a Package (For nautical charts or topo maps provided as a set of individual sheets, such as the Hema maps)
Scroll to view any part of your area of interest
Tap the Maps button on the toolbar, More Maps, Digital Map Shop. Tap Map Types if needed to select the type of map you are interested in.
Look for a listed item starting with "Package: ..."
When you tap that it will download all the maps in the package
At a later time, you can tap Maps, More Maps, Check for Map Updates. This will ensure you always have a complete set of up-to-date charts for all the packages you have downloaded.
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Along a planned route: (for seamless topo maps)
Plan the route you are going to travel (See Routes). Include any side trips or escape routes you might need.
Open the detailed map you want to download/activate.
Tap on a waypoint, Edit Route, or tap on a route in the overlay list.
Tap "Download Map"
Select "Along Route", and choose how wide the area of map you want surrounding your route.
Tap Start
If the map is a DMS Selections map, you are prompted to activate that area of map, if needed.
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Downloading a custom area: (for seamless topo maps)
Create a route that encloses the area of map you want
Place the last waypoint close to the first one. It does not need to be exact, as the polygon is automatically closed
Open the detailed map you want to download/activate.
Tap on a waypoint, Edit Route, or tap on a route in the overlay list.
Tap "Download Map"
Select "Enclosed"
Tap Start
If the map is a DMS Selections map, you are prompted to activate that area of map, if needed.
If you are going to leave the phone unattended while it downloads the data, plug it in, in case the battery is low.
All the map data, once loaded, is cached for future off-line use. If you want to free up some of your iPhone's memory, bring up the Map list, tap More Maps and All Maps on Device. Decide which map you want to delete and tap the little blue button to the right of the map. Tap Delete Map. If the map is licensed, this does not delete the license. You can download the map again in the future and use it any time.