There's nothing in Magellan's advertising to indicate the Sportrak Pro has a marine map. In fact, everything about its presentation suggests a land map. Here's from the website, and I submit that nothing in that language suggests a marine map. On the contrary, almost all of it suggests a terrestrial map, and a mostly terrestrial use:
"the SporTrak Pro features a 9 MB mapping database (North America), 23 MB free memory for downloading street-level maps."
"Your SporTrak Pro GPS receiver is an indispensable navigation companion when hiking, biking, boating, hunting, fishing or on any outdoor adventure."
Magellan Sportrak Pro
And if that isn't enough, making two products, Pro and Pro Marine, further suggests that the Pro is not intended for marine use and therefor is unlikely to come with a marine map.
If what you say is correct, and I certainly am not disputing you, then I wonder if you can point me to any Magellan material that says the marine map is what comes with the Sportrak Pro.
What would be the point in a marine map? This receiver is pitched directly at geocachers, and recreational users, all of whom do most of their thing on land. In all of history and myth, I can think of only one person who might be interested in geocaching on water, but then, He predates the GPS system by a couple of thousand years, and probably knows where all the caches are anyway.
My questions: can I replace the marine map with a useful terrestrial map? can I do so at little cost? where do I find the map and instructions?
Thanks very much.