Hi Bertrand. Fellow luddite here

Yes, there is an excellent chance of it coming our for Android. We're talking with a developer now, but realistically may need to do a bit of fundraising first. The cost for the development software is $300, and we're already running is the red from all the site hosting. So, yes it's coming, but realistically, it will be a few months.
As for your icon ideas. Let me tell you what we have currently, and then see what we should add. Right now the icons on the map signify the type of place. Formal established camping (like RV parks, or state parks), Wild camping (free, but no amenities), and informal camping (like a hotel parking lot, or a restaurant that let's you pitch a tent), and a bunch of others that are more self-explanatory. To see all the icons, click the "Show legend" button in the top right of the homepage.
We added to the list of amenities the ability to mark a place as "tent-friendly" and "big rig friendly". But, you have to do a search, or view the details of a place to see this info. For example, go here, and see the column on the left:
iOverlander | Altai Oasis. This place is marked as tent friendly and big-rig friendly. For hotels and hostels there is a field for "parking" so you can see how much space there is and where the parking is located. Is it on premise- or the garage 3 blocks away.
Based on your suggestions, I think we are missing two fields.
- A 4x4 icon for places with only concrete parking. I think this is similar to tent friendly. If it's just a parking lot, then we mark it not tent friendly. Am I understanding correctly?
- A moto icon for places that welcome 2-wheelers: This we could add, and we've considered in in the past. The question is, are there places that have parking and are tent friendly that don't welcome motos? What would this field signify aside from a fluffy tent spot and a place to park? Because those two items are already covered by other amenities. Hmmmm... let me know your thought on this.
Thank you for the feedback! It is always appreciated.
Jessica