In any graph, the maximum size of an induced path is bounded by the maximum size of a path. However, in the general case, one cannot find a converse bound, even up to an arbitrary function, as evidenced by the case of cliques. Galvin, Rival and Sands proved in 1982 that, when restricted to weakly sparse graphs, such a converse property actually holds. In this paper, we consider the maximal function $f$ such that any planar graph (and in general, any graph of bounded genus) containing a path on $n$ vertices contains an induced path of size $f(n)$, and prove that $f(n) \in Θ(\log n/\log \log n)$ by providing a lower bound matching the upper bound obtained by Esperet, Lemoine and Maffray, up to a constant factor. We obtain these tight bounds by analyzing graphs ordered along a Hamiltonian path that admit an edge partition into a bounded number of sets without crossing edges. In particular, we prove that the guaranteed size of an induced path when the ordered graph can be partitioned into $2k$, resp. $2k+1$, sets of non-crossing edges, is $Θ_k((\log n/\log \log n)^{1/k})$, resp. $Θ_k((\log n)^{1/(k + 1)})$.

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