Just wasted $20 for a GPS map for Grenada to run on a Garmin Nuvi. Thank goodness I didn't order the Trinidad/Tobago map (for $30!). Purchased this 'expensive' map because I wasn't happy with detail on the much less expensive apps that will run on an IPhone or an Android. The GPSTravelMap had no more detail than the $7 or $3 maps you can get from Amazon for an Android. So won't take my Nuvi on upcoming trip because it won't help any more than what I will already have -- an Android phone.